Table Of Contents
permit hostname (SIP)
phone context
phone number
pickup direct
pickup group
pickup local
playout-delay (dial peer)
playout-delay (voice-port)
playout-delay mode (dial peer)
playout-delay mode (voice-port)
port (Annex G neighbor BE)
port (dial peer)
port (MGCP profile)
port media
port signal
pots call-waiting
pots country
pots dialing-method
pots disconnect-supervision
pots disconnect-time
pots distinctive-ring-guard-time
pots encoding
pots forwarding-method
pots line-type
pots prefix filter
pots prefix number
pots ringing-freq
pots silence-time
pots tone-source
pre-dial delay
preference (dial peer)
preemption enable
preemption guard timer
preemption level
preemption tone timer
prefix
prefix (Annex G)
prefix (stcapp-fac)
prefix (stcapp-fsd)
presence
presence call-list
presence enable
pri-group (pri-slt)
pri-group nec-fusion
pri-group timeslots
privacy
progress_ind
protocol rlm port
proxy h323
permit hostname (SIP)
To store hostnames used during validatation of initial incoming INVITE messages, use the permit hostname command in SIP-ua configuration mode. To remove a stored hostname, use the no form of this command.
permit hostname dns: domain name
no permit hostname
Syntax Description
dns: domain name
|
Domain name in DNS format. Domain names can be up to 30 characters in length; domain names exceeding 30 characters will be truncated.
|
Command Modes
SIP-ua configuration
Command History
Release
|
Modification
|
12.4(9)T
|
This command was introduced.
|
Usage Guidelines
The permit hostname command allows you to specify hostnames in FQDN (fully qualified domain name) format used during validation of incoming initial INVITE messages. The length of the hostname can be up to 30 characters; hostnames exceeding 30 characters will be truncated. You can store up to 10 hostnames by repeating the permit hostname command.
Once configured, initial INVITEs with a hostname in the requested Universal Resource Identifier (URI) are compared to the configured list of hostnames. If there is a match, the INVITE is processed; if there is a mismatch, a "400 Bad Request - Invalid Host" is sent, and the call is rejected.
Note
Before Software Release 12.4(9)T, hostnames in incoming INVITE-request messages were only validated when they were in IPv4 format; now you can specify hostnames in fully qualified domain name (FQDN) format.
Examples
The following example show you how to set the hostname to sip.example.com:
Router(conf-sip-ua)# permit hostname dns:sip.example.com
phone context
To filter out uniform resource identifiers (URIs) that do not contain a phone-context field that matches the configured pattern, use the phone context command in voice URI class configuration mode. To remove the pattern, use the no form of this command.
phone context phone-context-pattern
no phone context
Syntax Description
phone-context-pattern
|
Cisco IOS regular expression pattern to match against the phone context field in a SIP or TEL URI. Can be up to 32 characters.
|
Command Default
No default behavior or values
Command Modes
Voice URI class configuration
Command History
Release
|
Modification
|
12.3(4)T
|
This command was introduced.
|
Usage Guidelines
•
Use this command with at least one other pattern-matching command, such as host, phone number, or user-id; using it alone does not result in any matches on the voice class.
•
You cannot use this command if you use the pattern command in the voice class. The pattern command matches on the entire URI, whereas this command matches only a specific field.
Examples
The following example sets a match on the phone context in the URI voice class:
Related Commands
Command
|
Description
|
destination uri
|
Specifies the voice class to use for matching the destination URI that is supplied by a voice application.
|
host
|
Matches a call based on the host field in a SIP URI.
|
incoming uri
|
Specifies the voice class used to match a VoIP dial peer to the URI of an incoming call.
|
pattern
|
Matches a call based on the entire SIP or TEL URI.
|
phone number
|
Matches a call based on the phone number field in a TEL URI.
|
show dialplan incall uri
|
Displays which dial peer is matched for a specific URI in an incoming voice call.
|
show dialplan uri
|
Displays which outbound dial peer is matched for a specific destination URI.
|
user-id
|
Matches a call based on the user-id field in the SIP URI.
|
voice class uri
|
Creates or modifies a voice class for matching dial peers to calls containing a SIP or TEL URI.
|
phone number
To match a call based on the phone-number field in a telephone (TEL) uniform resource identifier (URI), use the phone number command in voice URI class configuration mode. To remove the pattern, use the no form of this command.
phone number phone-number-pattern
no phone number
Syntax Description
phone-number-pattern
|
Cisco IOS regular expression pattern to match against the phone-number field in a TEL URI. Can be up to 32 characters.
|
Command Default
No default behavior or values
Command Modes
Voice URI class configuration
Command History
Release
|
Modification
|
12.3(4)T
|
This command was introduced.
|
Usage Guidelines
•
Use this command only in a voice class for TEL URIs.
•
You cannot use this command if you use the pattern command in the voice class. The pattern command matches on the entire URI, whereas this command matches only a specific field.
Examples
The following example defines a voice class that matches on the phone number field in a TEL URI:
Related Commands
Command
|
Description
|
debug voice uri
|
Displays debugging messages related to URI voice classes.
|
destination uri
|
Specifies the voice class to use for matching the destination URI that is supplied by a voice application.
|
incoming uri
|
Specifies the voice class used to match a VoIP dial peer to the URI of an incoming call.
|
pattern
|
Matches a call based on the entire SIP or TEL URI.
|
phone context
|
Filters out URIs that do not contain a phone-context field that matches the configured pattern.
|
voice class uri
|
Creates or modifies a voice class for matching dial peers to calls containing a SIP or TEL URI.
|
pickup direct
To designate an SCCP telephony control (STC) feature access code for directed call pickup, use the pickup direct command in STC application feature access-code configuration mode. To return the code to its default, use the no form of this command.
pickup direct keypad-character
no pickup direct
Syntax Description
keypad-character
|
Single character that can be dialed on a telephone keypad. Default is 6.
|
Command Default
The default code for directed call pickup is 6.
Command Modes
STC application feature access-code configuration
Command History
Release
|
Modification
|
12.4(2)T
|
This command was introduced.
|
Usage Guidelines
This command is used with the STC application, which enables certain features on analog FXS endpoints that use Skinny Client Control Protocol (SCCP) for call control.
Use this command to set the feature access code (FAC) for the directed pickup feature. Use this command only if you want to change the code from its default (6).
Note
This command is not supported for Cisco CallManager.
To use the directed pickup feature on a phone, dial the FAC prefix and the FAC that has been configured with this command (or the default if this command has not been used). Then dial the number that is ringing. For example, if the prefix is ** (the default), the feature access code is 6 (the default), and the ringing extension is 310, dial **6310 to pick up the call.
The directed pickup feature can also be used to retrieve the last call that was parked at a call-park slot by this extension. To retrieve the last parked call, dial the following sequence: FAC prefix, directed pickup FAC, and asterisk (*). The default is **6*.
If you set the directed pickup FAC code to a value that is already in use for another code, you receive a warning message. If you configure a duplicate code, the system implements the first matching feature in the order of precedence shown in the output of the show stcapp feature codes command.
The show running-config command displays nondefault FACs only. The show stcapp feature codes command displays all feature access codes.
Examples
The following example sets a feature access code prefix of two pound signs (##) and a directed pickup code of 3. After these values are configured, a phone user presses ##3 and the ringing extension number to pick up the incoming call.
Router(config)# stcapp feature access-code
Router(stcapp-fac)# prefix ##
Router(stcapp-fac)# call forward all 2
Router(stcapp-fac)# call forward cancel 4
Router(stcapp-fac)# pickup local 6
Router(stcapp-fac)# pickup group 5
Router(stcapp-fac)# pickup direct 3
Related Commands
Command
|
Description
|
call forward all
|
Designates an STC application feature access code to activate the forwarding of all calls.
|
call forward cancel
|
Designates an STC application feature access code to cancel the forwarding of all calls.
|
pickup group
|
Designates an STC application feature access code for group call pickup from another group.
|
pickup local
|
Designates an STC application feature access code for group call pickup from the local group.
|
prefix (stcapp-fac)
|
Designates a prefix to precede an STC application feature access code.
|
show running-config
|
Displays current nondefault configuration settings.
|
show stcapp feature codes
|
Displays configured and default STC application feature access codes.
|
stcapp feature access-code
|
Enters STC application feature access-code configuration mode to set feature access codes.
|
pickup group
To designate an SCCP telephony control (STC) feature access code for group call pickup, use the pickup group command in STC application feature access-code configuration mode. To return the code to its default, use the no form of this command.
pickup group keypad-character
no pickup group
Syntax Description
keypad-character
|
Single character that can be dialed on a telephone keypad. Default is 4.
|
Command Default
The default code for group call pickup is 4.
Command Modes
STC application feature access-code configuration
Command History
Release
|
Modification
|
12.4(2)T
|
This command was introduced.
|
Usage Guidelines
This command is used with the STC application, which enables certain features on analog FXS endpoints that use Skinny Client Control Protocol (SCCP) for call control.
Use this command to set the feature access code (FAC) for the group call pickup feature. Use this command only if you want to change the FAC from its default (4).
To use the group call pickup feature on a phone, dial the FAC prefix and the FAC that has been configured with this command (or the default if this command has not been used). Then dial the pickup group number of the phone that is ringing. For example, if the prefix is ** (the default), the FAC is 4 (the default), and the pickup group number of the ringing extension is 88, dial **488 to pick up the call.
If you set this FAC to a value that is already in use for another FAC, you receive a warning message. If you configure a duplicate code, the system implements the first matching feature in the order of precedence shown in the output of the show stcapp feature codes command.
The show running-config command displays nondefault FACs only. The show stcapp feature codes command displays all FACs.
Examples
The following example sets a FAC prefix of two pound signs (##) and a group pickup FAC of 3. After these values are configured, a phone user presses ##3 and the group number of the ringing extension number to pick up the incoming call.
Router(config)# stcapp feature access-code
Router(stcapp-fac)# prefix ##
Router(stcapp-fac)# call forward all 2
Router(stcapp-fac)# call forward cancel 4
Router(stcapp-fac)# pickup local 6
Router(stcapp-fac)# pickup group 3
Router(stcapp-fac)# pickup direct 5
Related Commands
Command
|
Description
|
call forward all
|
Designates an STC application feature access code to activate the forwarding of all calls.
|
call forward cancel
|
Designates an STC application feature access code to cancel the forwarding of all calls.
|
pickup direct
|
Designates an STC application feature access code for directed call pickup.
|
pickup local
|
Designates an STC application feature access code for group call pickup from the local group.
|
prefix (stcapp-fac)
|
Designates a prefix to precede an STC application feature access code.
|
show running-config
|
Displays current nondefault configuration settings.
|
show stcapp feature codes
|
Displays configured and default STC application feature access codes.
|
stcapp feature access-code
|
Enters STC application feature access-code configuration mode to set feature access codes.
|
pickup local
To designate an SCCP telephony control (STC) feature access code for group call pickup within a local group, use the pickup local command in STC application feature access-code configuration mode. To return the code to its default, use the no form of this command.
pickup local keypad-character
no pickup local
Syntax Description
keypad-character
|
Single character that can be dialed on a telephone keypad. Default is 3.
|
Command Default
The default code for local group pickup is 3.
Command Modes
STC application feature access-code configuration
Command History
Release
|
Modification
|
12.4(2)T
|
This command was introduced.
|
Usage Guidelines
This command is used with the STC application, which enables certain features on analog FXS endpoints that use Skinny Client Control Protocol (SCCP) for call control.
Use this command to set the feature access code (FAC) for the local group pickup feature. Use this command only if you want to change the FAC from its default (3).
To use the local group pickup feature on a phone, dial the FAC prefix and the FAC that has been configured with this command (or the default if this command has not been used). For example, if the prefix is ** (the default), the FAC is 3 (the default), and the pickup group of the ringing extension is the same as yours, dial **3 to pick up the call.
If you set this FAC to a value that is already in use for another FAC, you receive a warning message. If you configure a duplicate code, the system implements the first matching feature in the order of precedence shown in the output of the show stcapp feature codes command.
The show running-config command displays nondefault FACs only. The show stcapp feature codes command displays all FACs.
Examples
The following example sets a FAC prefix of two pound signs (##) and a local group pickup FAC of 6. After these values are configured, a phone user presses ##6 to pick up an incoming call in the same group.
Router(config)# stcapp feature access-code
Router(stcapp-fac)# prefix ##
Router(stcapp-fac)# call forward all 2
Router(stcapp-fac)# call forward cancel 4
Router(stcapp-fac)# pickup local 6
Router(stcapp-fac)# pickup group 5
Router(stcapp-fac)# pickup direct 3
Related Commands
Command
|
Description
|
call forward all
|
Designates an STC application feature access code to activate the forwarding of all calls.
|
call forward cancel
|
Designates an STC application feature access code to cancel the forwarding of all calls.
|
pickup direct
|
Designates an STC application feature access code for directed call pickup.
|
pickup group
|
Designates an STC application feature access code for group call pickup from another group.
|
prefix (stcapp-fac)
|
Designates a prefix to precede an STC application feature access code.
|
show running-config
|
Displays current nondefault configuration settings.
|
show stcapp feature codes
|
Displays configured and default STC application feature access codes.
|
stcapp feature access-code
|
Enters STC application feature access-code configuration mode to set feature access codes.
|
playout-delay (dial peer)
To tune the playout buffer on digital signal processors (DSPs) to accommodate packet jitter caused by switches in the WAN, use the playout-delay command in dial peer configuration mode. To reset the playout buffer to the default, use the no form of this command.
playout-delay {fax milliseconds | maximum milliseconds | minimum {default | low | high} |
nominal milliseconds}
no playout-delay {fax | maximum | minimum | nominal}
Syntax Description
fax milliseconds
|
Amount of playout delay that the jitter buffer should apply to fax calls, in milliseconds. Range is from 0 to 700. Default is 300.
|
maximum milliseconds
|
(Adaptive mode only) Upper limit of the jitter buffer, or the highest value to which the adaptive delay is set, in milliseconds.
Range is from 40 to 1700, although this value depends on the type of DSP and how the voice card is configured for codec complexity. (See the codec complexity command.) Default is 200.
If the voice card is configured for high codec complexity, the highest value that can be configured for maximum for compressed codecs is 250 ms. For medium-complexity codec configurations, the highest maximum value is 150 ms.
Voice hardware that does not support the voice card complexity configuration (such as analog voice modules for the Cisco 3600 series router) has an upper limit of 250 ms.
|
minimum
|
(Adaptive mode only) Lower limit of the jitter buffer, or the lowest value to which the adaptive delay is set, in milliseconds. Values are as follows:
• default—40 ms. Use when there are normal jitter conditions in the network. This is the default.
• low—10 ms. Use when there are low jitter conditions in the network.
• high—40 ms. Use when there are high jitter conditions in the network.
|
nominal milliseconds
|
Amount of playout delay applied at the beginning of a call by the jitter buffer in the gateway, in milliseconds. In fixed mode, this is also the maximum size of the jitter buffer throughout the call.
Range is from 0 to 1500, although this value depends on the type of DSP and how the voice card is configured for codec complexity. Default is 200.
For non-conference calls when you are using DSPware version 4.1.33 or a later version, the following values are allowed. If the voice card is configured for high codec complexity, the highest value that can be configured for the nominal keyword for compressed codecs is 250 ms. For medium-complexity codec configurations, the highest nominal value is 150 ms.
For conference calls when you are using DSPware version 4.1.33 or a later version, the first decoder stream can be assigned a nominal value as high as 250 ms (high-complexity codec) or 150 ms (medium-complexity codec). Subsequent decoder streams are limited to the highest nominal value of 150 ms (high-complexity) or 80 ms (medium-complexity).
|
nominal milliseconds (continued)
|
Voice hardware that does not support the voice-card complexity configuration (such as analog voice modules for the Cisco 3600 series router) has an upper limit of 250 ms for the first decoder stream and 150 ms for subsequent decoder streams.
Note With DSPware versions earlier than 4.1.33, the highest nominal value that can be configured is 150 ms for high-complexity codec configurations and analog modules. The highest nominal value for medium-complexity codec configurations is 80 ms.
|
Defaults
fax—300 milliseconds
maximum—200 milliseconds
minimum—default (40 milliseconds)
nominal—200 milliseconds
Command Modes
Dial peer configuration (config-dial-peer)
Command History
Release
|
Modification
|
11.3(1)MA
|
This command was introduced on the Cisco MC3810.
|
12.0(7)XK
|
This command was implemented on the Cisco 2600 series and Cisco 3600 series.
|
12.1(2)T
|
This command was integrated into Cisco IOS Release 12.1(2)T.
|
12.1(3)XI
|
This command was implemented on the Cisco ICS7750.
|
12.1(5)T
|
This command was integrated into Cisco IOS Release 12.1(5)T. Support for dial peer configuration mode was added on the following platforms: Cisco 2600 series, Cisco 3600 series, Cisco 7200 series, Cisco MC3810, Cisco AS5200, Cisco AS5300, Cisco AS5400, and Cisco AS5800. The minimum keyword was introduced.
|
12.2(13)T
|
The fax keyword was introduced.
|
12.2(13)T8
|
DSPware version 4.1.33 was implemented.
|
Usage Guidelines
Before Cisco IOS Release 12.1(5)T, this command was used in voice-port configuration mode. For Cisco IOS Release 12.1(5)T and later releases, in most cases playout delay should be configured in dial-peer configuration mode on the Voice over IP (VoIP) dial peer that is on the receiving end of the voice traffic that is to be buffered. This dial peer senses network conditions and relays them to the DSPs, which adjust the jitter buffer as necessary. When multiple applications are configured on the gateway, playout delay should be configured in dial-peer configuration mode. When there are numerous dial peers to configure, it might be simpler to configure playout delay on a voice port. If conflicting playout-delay values have been configured on a voice port and on a dial peer, the dial-peer configuration takes precedence.
Playout delay is the amount of time that elapses between the time at which a voice packet is received at the jitter buffer on the DSP and the time at which it is played out to the codec. In most networks with normal jitter conditions, the defaults are adequate and you will not need to configure this command.
In situations in which you want to improve voice quality by reducing jitter or you want to reduce network delay, you can configure playout-delay parameters. The parameters are slightly different for each of the two playout-delay modes, adaptive and fixed (see the playout-delay mode command).
In adaptive mode, the average delay for voice packets varies depending on the amount of interarrival variation that packets have as the call progresses. The jitter buffer grows and shrinks to compensate for jitter and to keep voice packets playing out smoothly, within the maximum and minimum limits that have been configured. The maximum limit establishes the highest value to which the adaptive delay is set. The minimum limit is the low-end threshold for the delay of incoming packets by the adaptive jitter buffer. Algorithms in the DSPs that control the growth and shrinkage of the jitter buffer are weighted toward the improvement of voice quality at the expense of network delay: jitter buffer size increases rapidly in response to spikes in network transmissions and decreases slowly in response to reduced congestion.
In fixed mode, the nominal value is the amount of playout delay applied at the beginning of a call by the jitter buffer in the gateway and is also the maximum size of the jitter buffer throughout the call.
As a general rule, if there is excessive breakup of voice due to jitter with the default playout-delay settings, increase playout delay times. If your network is small and jitter is minimal, decrease playout-delay times for a smaller overall delay.
When there is bursty jitter in the network, voice quality can be degraded even though the jitter buffer is actually adjusting the playout delay correctly. The constant readjustment of playout delay to erratic network conditions causes voice quality problems that are usually alleviated by increasing the minimum playout delay-value in adaptive mode or by increasing the nominal delay for fixed mode.
Use the show call active voice command to display the current delay, as well as high- and low-water marks for delay during a call. Other fields that can help determine the size of a jitter problem are ReceiveDelay, GapFillWith..., LostPackets, EarlyPackets, and LatePackets. The following is sample output from the show call active voice command:
ConnectionId[0xECDE2E7B 0xF46A003F 0x0 0x47070A4]
IncomingConnectionId[0xECDE2E7B 0xF46A003F 0x0 0x47070A4]
RemoteIPAddress=192.168.100.101
tx_DtmfRelay=inband-voice
Separate H245 Connection=FALSE
GapFillWithSilence=850 ms
GapFillWithPrediction=2590 ms
GapFillWithInterpolation=0 ms
GapFillWithRedundancy=0 ms
HiWaterPlayoutDelay=70 ms
LoWaterPlayoutDelay=29 ms
Examples
The following example uses default adaptive mode with a minimum playout delay of 10 ms and a maximum playout delay of 60 ms on VoIP dial peer 80. The size of the jitter buffer is adjusted up and down on the basis of the amount of jitter that the DSP finds, but is never smaller than 10 ms and never larger than 60 ms.
playout-delay minimum low
Related Commands
Command
|
Description
|
codec complexity
|
Specifies call density and codec complexity based on the codec standard you are using.
|
playout-delay (voice-port)
|
Tunes the playout buffer to accommodate packet jitter caused by switches in the WAN.
|
playout-delay mode
|
Selects fixed or adaptive mode for the jitter buffer on DSPs.
|
show call active voice
|
Displays active call information for voice calls.
|
playout-delay (voice-port)
To tune the playout buffer to accommodate packet jitter caused by switches in the WAN, use the playout-delay command in voice-port configuration mode. To reset the playout buffer to the default, use the no form of this command.
playout-delay {fax | maximum | nominal} milliseconds
no playout-delay {fax | maximum | nominal}
Syntax Description
fax milliseconds
|
Amount of playout delay that the jitter buffer should apply to fax calls, in milliseconds. Range is from 0 to 700. Default is 300.
|
maximum milliseconds
|
Delay time that the digital signal processor (DSP) allows before starting to discard voice packets, in milliseconds. Range is from 40 to 320. Default is 160.
|
nominal milliseconds
|
Initial (and minimum allowed) delay time that the DSP inserts before playing out voice packets, in milliseconds. Range is from 40 to 240. Default is 80.
|
Defaults
fax—300 milliseconds
maximum—160 milliseconds
nominal—80 milliseconds
Command Modes
Voice-port configuration
Command History
Release
|
Modification
|
11.3(1)MA
|
This command was introduced on the Cisco MC3810.
|
12.0(7)XK
|
This command was implemented on the Cisco 2600 series and Cisco 3600 series.
|
12.1(2)T
|
This command was integrated into Cisco IOS Release 12.1(2)T.
|
12.2(13)T
|
The fax keyword was added.
|
Usage Guidelines
If there is excessive breakup of voice due to jitter with the default playout delay settings, increase the delay times. If your network is small and jitter is minimal, decrease the delay times to reduce delay.
Before Cisco IOS Release 12.1(5)T, the playout-delay command was configured in voice-port configuration mode. For Cisco IOS Release 12.1(5)T and later releases, in most cases playout delay should be configured in dial-peer configuration mode on the Voice over IP (VoIP) dial peer that is on the receiving end of the voice traffic that is to be buffered. This dial peer senses network conditions and relays them to the DSPs, which adjust the jitter buffer as necessary. When multiple applications are configured on the gateway, playout delay should be configured in dial-peer configuration mode. When there are numerous dial peers to configure, it might be simpler to configure playout delay on a voice port. If conflicting playout-delay values have been configured on a voice port and on a dial peer, the dial-peer configuration takes precedence.
Playout delay is the amount of time that elapses between the time at which a voice packet is received at the jitter buffer on the DSP and the time at which it is played out to the codec. In most networks with normal jitter conditions, the defaults are adequate and you will not need to configure the playout-delay command.
In situations in which you want to improve voice quality by reducing jitter or you want to reduce network delay, you can configure playout-delay parameters. The parameters are slightly different for each of the two playout-delay modes, adaptive and fixed (see the playout-delay mode command).
In adaptive mode, the average delay for voice packets varies depending on the amount of interarrival variation that packets have as the call progresses. The jitter buffer grows and shrinks to compensate for jitter and to keep voice packets playing out smoothly, within the maximum and minimum limits that have been configured. The maximum limit establishes the highest value to which the adaptive delay will be set. The minimum limit is the low-end threshold for incoming packet delay that is created by the adaptive jitter buffer. Algorithms in the DSPs that control the growth and shrinkage of the jitter buffer are weighted toward the improvement of voice quality at the expense of network delay: jitter buffer size increases rapidly in response to spikes in network transmissions and decreases slowly in response to reduced congestion.
In fixed mode, the nominal value is the amount of playout delay applied at the beginning of a call by the jitter buffer in the gateway and is also the maximum size of the jitter buffer throughout the call.
As a general rule, if there is excessive breakup of voice due to jitter with the default playout-delay settings, increase playout-delay times. If your network is small and jitter is minimal, decrease playout-delay times for a smaller overall delay.
When there is bursty jitter in the network, voice quality can be degraded even though the jitter buffer is actually adjusting the playout delay correctly. The constant readjustment of playout delay to erratic network conditions causes voice quality problems that are usually alleviated by increasing the minimum playout-delay value in adaptive mode or by increasing the nominal delay for fixed mode.
Note
The minimum limit for playout delay is configured using the playout-delay (dial peer) command.
Use the show call active voice command to display the current delay, as well as high- and low-water marks for delay during a call. Other fields that can help determine the size of a jitter problem are GapFillWith..., ReceiveDelay, LostPackets, EarlyPackets, and LatePackets. The following is sample output from the show call active voice command:
ConnectionId[0xECDE2E7B 0xF46A003F 0x0 0x47070A4]
IncomingConnectionId[0xECDE2E7B 0xF46A003F 0x0 0x47070A4]
RemoteIPAddress=192.168.100.101
tx_DtmfRelay=inband-voice
Separate H245 Connection=FALSE
GapFillWithSilence=850 ms
GapFillWithPrediction=2590 ms
GapFillWithInterpolation=0 ms
GapFillWithRedundancy=0 ms
HiWaterPlayoutDelay=70 ms
LoWaterPlayoutDelay=29 ms
Examples
The following example sets nominal playout delay to 80 ms and maximum playout delay to 160 ms on voice port 1/0/0:
playout-delay maximum 160
Related Commands
Command
|
Description
|
playout-delay (dial peer)
|
Tunes the playout buffer on DSPs to accommodate packet jitter caused by switches in the WAN.
|
playout-delay mode
|
Selects fixed or adaptive mode for playout delay from the jitter buffer on digital signal processors.
|
show call active
|
Shows active call information for voice calls or fax transmissions in progress.
|
vad
|
Enables voice activity detection.
|
playout-delay mode (dial peer)
To select fixed or adaptive mode for playout delay from the jitter buffer on digital signal processors (DSPs), use the playout-delay mode command in dial peer configuration mode. To reset to the default, use the no form of this command.
playout-delay mode {adaptive | fixed}
no playout-delay mode
Syntax Description
adaptive
|
Jitter buffer size and amount of playout delay are adjusted during a call, on the basis of current network conditions.
|
fixed
|
Jitter buffer size does not adjust during a call; a constant playout delay is added.
|
Command Default
Adaptive jitter buffer size
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
12.1(5)T
|
This command was introduced on the following platforms: Cisco 2600 series, Cisco 3600 series, Cisco MC3810, and Cisco ICS 7750. The no-timestamps keyword was removed.
|
Usage Guidelines
Before Cisco IOS Release 12.1(5)T, this command was used only in voice-port configuration mode. For Cisco IOS Release 12.1(5)T and later releases, in most cases playout delay should be configured in dial peer configuration mode on the VoIP dial peer that is on the receiving end of the voice traffic that is to be buffered. This dial peer senses network conditions and relays them to the DSPs, which adjust the jitter buffer as necessary. When multiple applications are configured on the gateway, playout delay should be configured in dial peer configuration mode.
Tip
When there are numerous dial peers to configure, it might be simpler to configure playout delay on a voice port. If conflicting playout delay values have been configured on a voice port and on a dial peer, the dial peer configuration takes precedence.
In most networks with normal jitter conditions, the default is adequate and you do not need to configure this command.
The default is adaptive mode, in which the average delay for voice packets varies depending on the amount of interarrival variation that packets have as the call progresses. The jitter buffer grows and shrinks to compensate for jitter and to keep voice packets playing out smoothly, within the maximum and minimum limits that have been configured.
Select fixed mode only when you understand your network conditions well, and when you have a network with very poor quality of service (QoS) or when you are interworking with a media server or similar transmission source that tends to create a lot of jitter at the transmission source. In most situations it is better to configure adaptive mode and let the DSP size the jitter buffer according to current conditions.
Examples
The following example sets adaptive playout-delay mode with a high (80 ms) minimum delay on a VoIP dial peer 80:
playout-delay mode adaptive
playout-delay minimum high
Related Commands
Command
|
Description
|
playout-delay
|
Tunes the jitter buffer on DSPs for playout delay of voice packets.
|
show call active voice
|
Displays active call information for voice calls.
|
playout-delay mode (voice-port)
To select fixed or adaptive mode for playout delay from the jitter buffer on digital signal processors (DSPs), use the playout-delay mode command in voice port configuration mode. To reset to the default, use the no form of this command.
playout-delay mode {adaptive | fixed}
no playout-delay mode
Syntax Description
adaptive
|
Jitter buffer size and amount of playout delay are adjusted during a call, on the basis of current network conditions.
|
fixed
|
Jitter buffer size does not adjust during a call; a constant playout delay is added.
|
Command Default
Adaptive jitter buffer size
Command Modes
Voice-port configuration
Command History
Release
|
Modification
|
11.3(1)MA
|
This command was introduced on the Cisco MC3810.
|
12.0(7)XK
|
This command was implemented on the Cisco 2600 and Cisco 3600 series.
|
12.1(2)T
|
This command was integrated into Cisco IOS Release 12.1(2)T.
|
12.1(3)XI
|
This command was implemented on the Cisco ICS 7750. The keyword mode was introduced.
|
12.1(5)T
|
This command was integrated into Cisco IOS Release 12.1(5)T and the no-timestamps keyword was removed.
|
Usage Guidelines
Before Cisco IOS Release 12.1(5)T, this command was used only in voice-port configuration mode. For Cisco IOS Release 12.1(5)T and later releases, in most cases playout delay should be used in dial peer configuration mode on the VoIP dial peer that is on the receiving end of the voice traffic that is to be buffered. This dial peer senses network conditions and relays them to the DSPs, which adjust the jitter buffer as necessary. When multiple applications are configured on the gateway, playout delay should be configured in dial peer configuration mode.
Tip
When there are numerous dial peers to configure, it might be simpler to configure playout delay on a voice port. If conflicting playout delay values have been configured on a voice port and on a dial peer, the dial peer configuration takes precedence.
In most networks with normal jitter conditions, the default is adequate and you do not need to configure the playout-delay mode command.
The default is adaptive mode, in which the average delay for voice packets varies depending on the amount of interarrival variation that packets have as the call progresses. The jitter buffer grows and shrinks to compensate for jitter and to keep voice packets playing out smoothly, within the maximum and minimum limits that have been configured.
Select fixed mode only when you understand your network conditions well, and when you have a network with very poor quality of service (QoS) or when you are interworking with a media server or similar transmission source that tends to create a lot of jitter at the transmission source. In most situations it is better to configure adaptive mode and let the DSP size the jitter buffer according to current conditions.
Examples
The following example sets fixed mode on a Cisco 3640 voice port with a nominal delay of 80 ms.
Related Commands
Command
|
Description
|
playout-delay
|
Tunes the jitter buffer on DSPs for playout delay of voice packets.
|
show call active voice
|
Displays active call information for voice calls.
|
port (Annex G neighbor BE)
To configure the port number of the neighbor that is used for exchanging Annex G messages, use the port command in Annex G Neighbor BE configuration mode. To remove the port number, use the no form of this command.
port neighbor-port
no port
Syntax Description
neighbor-port
|
Port number of the neighbor. This number is used for exchanging Annex G messages. The default port number is 2099.
|
Command Default
2099
Command Modes
Annex G Neighbor BE Configuration
Command History
Release
|
Modification
|
12.2(2)XA
|
This command was introduced.
|
12.2(4)T
|
This command was integrated into Cisco IOS Release 12.2(4)T. Support for the Cisco AS5300, Cisco AS5350, and Cisco AS5400 is not included in this release.
|
12.2(2)XB1
|
This command was implemented on the Cisco AS5850.
|
12.2(11)T
|
This command was integrated into Cisco IOS Release 12.2(11)T. This command is supported on the Cisco AS5300, Cisco AS5350, and Cisco AS5400 in this release.
|
Examples
The following example sets a neighbor BE to port number 2010.
Router(config-annexg-neigh)# port 2010
Related Commands
Command
|
Description
|
advertise (annex g)
|
Controls the types of descriptors that the BE advertises to its neighbors.
|
cache
|
Configures the local BE to cache the descriptors received from its neighbors.
|
id
|
Configures the local ID of the neighboring BE.
|
query-interval
|
Configures the interval at which the local BE will query the neighboring BE.
|
port (dial peer)
To associate a dial peer with a specific voice port, use the port command in dial peer configuration mode. To cancel this association, use the no form of this command.
Cisco 1750 and Cisco 3700 Series
port slot-number/port
no port slot-number/port
Cisco 2600 series, Cisco 3600 Series, and Cisco 7200 Series
port {slot-number/subunit-number/port | slot/port:ds0-group-no}
no port {slot-number/subunit-number/port | slot/port:ds0-group-no}
Cisco AS5300
port controller-number:D
no port controller-number:D
Cisco uBR92x Series
port slot/subunit/port
no port slot/subunit/port
Syntax Description
Cisco 1750 and Cisco 3700 Series
slot-number
|
Number of the slot in the router in which the voice interface card (VIC) is installed. Valid entries are from 0 to 2, depending on the slot in which it has been installed.
|
port
|
Voice port number. Valid entries are 0 and 1.
|
Cisco 2600 series, Cisco 3600 Series, and Cisco 7200 Series
slot-number
|
Number of the slot in the router in which the VIC is installed. Valid entries are from 0 to 3, depending on the slot in which it has been installed.
|
subunit-number
|
Subunit on the VIC in which the voice port is located. Valid entries are 0 and 1.
|
port
|
Voice port number. Valid entries are 0 and 1.
|
slot
|
Router location in which the voice port adapter is installed. Valid entries are 0 and 3.
|
port
|
Voice interface card location. Valid entries are 0 and 3.
|
ds0-group-no
|
Specifies the DS0 group number. Each defined DS0 group number is represented on a separate voice port. This allows you to define individual DS0s on the digital T1/E1 card.
|
Cisco AS5300
controller-number
|
Specifies the T1 or E1 controller.
|
:D
|
Indicates the D channel associated with ISDN PRI.
|
Cisco uBR92x series
slot/subunit/port
|
Specifies the analog voice port. Valid entries for the slot/subunit/port are as follows:
• slot—specifies a router slot in which a voice network module (NM) is installed. Valid entries are router slot numbers for the particular platform.
• subunit—specifies a VIC in which the voice port is located. Valid entries are 0 and 1. (The VIC fits into the voice network module.)
• port—specifies an analog voice port number. Valid entries are 0 and 1.
|
Command Default
No port is configured.
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
11.3(1)T
|
This command was introduced on the Cisco 3600 series.
|
11.3(3)T
|
This command was implemented on the Cisco 2600 series.
|
11.3(1)MA
|
This command was implemented on the Cisco MC3810.
|
12.0(3)T
|
This command was integrated into Cisco IOS Release 12.0(3)T and implemented on the Cisco AS5300.
|
12.0(4)T
|
This command was implemented on the Cisco uBR924.
|
12.0(7)T
|
This command was implemented on the Cisco AS5800.
|
12.2(8)T
|
This command was implemented on the following platforms: Cisco 1751, Cisco 3725, and Cisco 3745.
|
12.2(13)T
|
This command was integrated into Cisco IOS Release 12.2(13)T. This command does not support the extended echo canceller (EC) feature on the Cisco AS5300 or the Cisco AS5800.
|
Usage Guidelines
This command is used for calls that come from a telephony interface to select an incoming dial peer and for calls that come from the VoIP network to match a port with the selected outgoing dial peer.
This command applies only to POTS peers.
Note
This command does not support the extended echo canceller (EC) feature on the Cisco AS5300.
Examples
The following example associates POTS dial peer 10 with voice port 1, which is located on subunit 0 and accessed through port 0:
The following example associates POTS dial peer 10 with voice port 0:D:
The following example associates POTS dial peer 10 with voice port 1/0/0:D (T1 card):
Related Commands
Command
|
Description
|
prefix
|
Specifies the prefix of the dialed digits for a dial peer.
|
port (MGCP profile)
To associate a voice port with the Media Gateway Control Protocol (MGCP) profile that is being configured, use the port command in MGCP profile configuration mode. To disassociate the voice port from the profile, use the no form of this command.
port port-number
no port port-number
Syntax Description
port-number
|
Voice port or DS0-group number to be used as an MGCP endpoint associated with an MGCP profile.
|
Command Default
No default behavior or values
Command Modes
MGCP profile configuration
Command History
Release
|
Modification
|
12.2(2)XA
|
This command was introduced as the voice-port (MGCP profile) command.
|
12.2(4)T
|
This command was integrated into Cisco IOS Release 12.2(4)T.
|
12.2(8)T
|
This command was renamed the port (MGCP profile) command.
|
Usage Guidelines
This command is used when values for an MGCP profile are configured.
This command associates a voice port with the MGCP profile that is being defined. To associate multiple voice ports with a profile, repeat this command with different voice port arguments.
This command is not used when the default MGCP profile is configured because the values in the default profile configuration apply to all parameters that have not been otherwise configured for a user-defined MGCP profile.
Examples
The following example associates an analog voice port with an MGCP profile on a Cisco uBR925 platform:
Router(config)# mgcp profile ny110ca
Router(config-mgcp-profile)# port 0
Related Commands
Command
|
Description
|
mgcp
|
Starts and allocates resources for the MGCP daemon.
|
mgcp profile
|
Initiates MGCP profile mode to create and configure a named MGCP profile associated with one or more endpoints or to configure the default profile.
|
port media
To specify the serial interface to which the local video codec is connected for a local video dial peer, use the port media command in video dial peer configuration mode. To remove any configured locations from the dial peer, use the no form of this command.
port media interface
no port media
Syntax Description
interface
|
Serial interface to which the local codec is connected. Valid entries are 0 and 1.
|
Command Default
No interface is specified
Command Modes
Video dial peer configuration
Command History
Release
|
Modification
|
12.0(5)XK
|
This command was introduced for ATM video dial peer configuration on the Cisco MC3810.
|
12.0(7)T
|
This command was integrated into Cisco IOS Release 12.0(7)T.
|
Examples
The following example specifies serial interface 0 as the specified interface for the codec local video dial peer 10:
dial-peer video 10 videocodec
Related Commands
Command
|
Description
|
port signal
|
Specifies the slot location of the VDM and the port location of the EIA/TIA-366 interface for signaling.
|
show dial-peer video
|
Displays dial peer configuration.
|
port signal
To specify the slot location of the video dialing module (VDM) and the port location of the EIA/TIA-366 interface for signaling for a local video dial peer, use the port signal command in video dial peer configuration mode. To remove any configured locations from the dial peer, use the no form of this command.
port signal slot/port
no port signal
Syntax Description
slot
|
Slot location of the VDM. Valid values are 1 and 2.
|
port
|
Port location of the EIA/TIA-366 interface.
|
Command Default
No locations are specified
Command Modes
Video dial peer configuration
Command History
Release
|
Modification
|
12.0(5)XK
|
This command was introduced for ATM video dial peer configuration on the Cisco MC3810.
|
12.0(7)T
|
This command was integrated into Cisco IOS Release 12.0(7)T.
|
Examples
The following example sets up the VDM and EIA/TIA-366 interface locations for the local video dial peer designated as 10:
dial-peer video 10 videocodec
Related Commands
Command
|
Description
|
port media
|
Specifies the serial interface to which the local video codec is connected.
|
show dial-peer video
|
Displays dial peer configuration.
|
pots call-waiting
To enable the local call-waiting feature, use the global configuration pots call-waiting command in global configuration mode. To disable the local call-waiting feature, use the no form of this command.
pots call-waiting {local | remote}
no pots call-waiting {local | remote}
Syntax Description
local
|
Enable call waiting on a local basis for the routers.
|
remote
|
Rely on the network provider service instead of the router to hold calls.
|
Command Default
Remote, in which case the call- holding pattern follows the settings of the service provider rather than those of the router.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.1.(2)XF
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
To display the call-waiting setting, use the show running-config or show pots status command. The ISDN call waiting service is used if it is available on the ISDN line connected to the router even if local call waiting is configured on the router. That is, if the ISDN line supports call waiting, the local call waiting configuration on the router is ignored.
Examples
The following example enables local call waiting on a router:
Related Commands
Command
|
Description
|
call-waiting
|
Configures call waiting for a specific dial peer.
|
show pots status
|
Displays the settings of the physical characteristics and other information on the telephone interfaces of a Cisco 800 series router.
|
pots country
To configure your connected telephones, fax machines, or modems to use country-specific default settings for each physical characteristic, use the pots country command in global configuration mode. To disable the use of country-specific default settings, use the no form of this command.
pots country country
no pots country country
Syntax Description
country
|
Country in which your router is located.
|
Command Default
A default country is not defined.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to the Cisco 800 series routers.
If you need to change a country-specific default setting of a physical characteristic, you can use the associated command listed in the "Related Commands" section. Enter the pots country ? command to get a list of supported countries and the code you must enter to indicate a particular country.
Examples
The following example specifies that the devices connected to the telephone ports use default settings specific to Germany for the physical characteristics:
Related Commands
Command
|
Description
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots dialing-method
To specify how the router collects and sends digits dialed on your connected telephones, fax machines, or modems, use the pots dialing-method command in global configuration mode. To disable the specified dialing method, use the no form of this command.
pots dialing-method {overlap | enblock}
no pots dialing-method {overlap | enblock}
Syntax Description
overlap
|
The router sends each digit dialed in a separate message.
|
enblock
|
The router collects all digits dialed and sends the digits in one message.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
To interrupt the collection and transmission of dialed digits, enter a pound sign (#), or stop dialing digits until the interdigit timer runs out (10 seconds).
Examples
The following example specifies that the router uses the enblock dialing method:
pots dialing-method enblock
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots disconnect-supervision
To specify how a router notifies the connected telephones, fax machines, or modems when the calling party has disconnected, use the pots disconnect-supervision command in global configuration mode. To disable the specified disconnect method, use the no form of this command.
pots disconnect-supervision {osi | reversal}
no pots disconnect-supervision {osi | reversal}
Syntax Description
osi
|
Open switching interval (OSI) is the duration for which DC voltage applied between tip and ring conductors of a telephone port is removed.
|
reversal
|
Polarity reversal of tip and ring conductors of a telephone port.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Most countries except Japan typically use the osi option. Japan typically uses the reversal option.
Examples
The following example specifies that the router uses the OSI disconnect method:
pots disconnect-supervision osi
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots disconnect-time
To specify the interval in which the disconnect method is applied if your connected telephones, fax machines, or modems fail to detect that a calling party has disconnected, use the pots disconnect-time command in global configuration mode. To disable the specified disconnect interval, use the no form of this command.
pots disconnect-time interval
no pots disconnect-time interval
Syntax Description
interval
|
Interval, in milliseconds. Range is from 50 to 2000.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
The pots disconnect-supervision command configures the disconnect method.
Examples
The following example specifies that the connected devices apply the configured disconnect method for 100 ms after a calling party disconnects:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots distinctive-ring-guard-time
To specify the delay in which a telephone port can be rung after a previous call is disconnected, use the pots distinctive-ring-guard-time command in global configuration mode. To disable the specified delay, use the no form of this command.
pots distinctive-ring-guard-time milliseconds
no pots distinctive-ring-guard-time milliseconds
Syntax Description
milliseconds
|
Delay, in milliseconds. Range is from 0 to 1000.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Examples
The following example specifies that a telephone port can be rung 100 ms after a previous call is disconnected:
pots distinctive-ring-guard-time 100
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
ring
|
Sets up a distinctive ring for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots encoding
To specify the pulse code modulation (PCM) encoding scheme for your connected telephones, fax machines, or modems, use the pots encoding command in global configuration mode. To disable the specified scheme, use the no form of this command.
pots encoding {alaw | ulaw}
no pots encoding {alaw | ulaw}
Syntax Description
alaw
|
A-law. International Telecommunication Union Telecommunication Standardization Section (ITU-T) PCM encoding scheme used to represent analog voice samples as digital values.
|
ulaw
|
Mu-law. North American PCM encoding scheme used to represent analog voice samples as digital values.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Europe typically uses a-law. North America typically uses u-law.
Examples
The following example specifies a-law as the PCM encoding scheme:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots forwarding-method
To configure the type of call-forwarding method to be used for Euro-ISDN (formerly NET3) switches, use the pots forwarding-method command in global configuration mode. To turn forwarding off, use the no form of this command.
pots forwarding-method {keypad | functional}
no pots forwarding-method {keypad | functional}
Syntax Description
keypad
|
Gives forwarding control to the Euro-ISDN switch.
|
functional
|
Gives forwarding control to the router. If you select this method, use the dual-tone multifrequency (DTMF) keypad commands listed in Table 29 to configure call-forwarding service.
|
Command Default
Forwarding is off
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.2(2)T
|
This command was introduced.
|
Usage Guidelines
Use this command to select the type of forwarding method to be used for Euro-ISDN switches. This command does not affect any other switch types.
You can select one or more call-forwarding services at a time, but keep the following Euro-ISDN switch characteristics in mind:
•
Call forward unconditional (CFU) redirects a call without restriction and takes precedence over other call-forwarding service types.
•
Call forward busy (CFB) redirects a call to another number if the dialed number is busy.
•
Call forward no reply (CFNR) forwards a call to another number if the dialed number does not answer within a specified period of time.
If all three call-forwarding services are enabled, CFU overrides CFB and CFNR. The default is that no call-forwarding service is selected.
If you select the functional forwarding method, use the DTMF keypad commands in Table 29 to configure the call-forwarding service.
Table 29 DTMF Keypad Commands for Call-Forwarding Service
Task
|
|
Activate CFU
|
**21*number#
|
Deactivate CFU
|
#21#
|
Activate CFNR
|
**61*number#
|
Deactivate CFNR
|
#61#
|
Activate CFB
|
**67*number#
|
Deactivate CFB
|
#67#
|
When you enable or disable the call-forwarding service, it is enabled or disabled for four basic services: speech, audio at 3.1 kilohertz (kHz), telephony at 3.1 kHz, and telephony at 7 kHz. You should hear a dial tone after you enter the DTMF keypad command when the call-forwarding service is successfully enabled for at least one of the four basic services. If you hear a busy tone, the command is invalid or the switch does not support that service.
Examples
The following example gives forwarding control to the router:
pots forwarding-method functional
Related Commands
Command
|
Description
|
pots prefix filter
|
Sets a filter that prevents a dial prefix from being added to a dialed number when the digits in the dialed number match the filter.
|
pots prefix number
|
Sets a prefix to be added to a called telephone number for analog or modem calls.
|
pots line-type
To specify the impedance of your connected telephones, fax machines, or modems, use the pots line-type command in global configuration mode. To disable the specified line type, use the no form of this command.
pots line-type {type1 | type2 | type3}
no pots line-type {type1 | type2 | type3}
Syntax Description
type1
|
Runs at 600 ohms.
|
type2
|
Runs at 900 ohms.
|
type3
|
Runs at 300 or 400 ohms.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Examples
The following example sets the line type to type1:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots prefix filter
To set a filter that prevents a dial prefix from being added to a dialed number when the digits in the dialed number match the filter, use the pots prefix filter command in global configuration mode. To remove the filter, use the no form of this command.
pots prefix filter number
no pots prefix filter number
Syntax Description
number
|
Prefix filter numbers, up to a maximum of eight characters.
|
Command Default
No default filter is set.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.2(2)T
|
This command was introduced on the Cisco 803 and Cisco 804.
|
Usage Guidelines
The pots prefix filter command is used to set a filter for prefix dialing. A maximum of ten filters can be set. Once the maximum number of filters have been configured, an additional filter is not accepted nor does it overwrite any of the existing filters.
To configure a new filter, remove at least one filter using the no pots prefix filter command.
You can set matching criteria for the filter using the * wildcard character. For example, if you configure the filter 1* and a dialed number starts with 1, the called number is not prefixed. Prefix filters can be of variable length. All configured prefix filters are compared to the number dialed, up to the length of the prefix filter. If there is a match, no prefix is added to the dialed number.
Examples
The following example configures five filters that prevent dial prefixes from being added to dialed numbers:
With these filters configured, a prefix is not added to the following dialed numbers:
192 Directory calls
100 Operator services
999 Emergency services
0800... Toll-free calls
08456...Calls on an Energis network information controller
Related Commands
Command
|
Description
|
pots forwarding-method
|
Configures the type of forwarding method to be used for Euro-ISDN (formerly NET3) switches.
|
pots prefix number
|
Sets a prefix to be added to a called telephone number for analog or modem calls.
|
pots prefix number
To set a prefix to be added to a called telephone number for analog or modem calls, use the pots prefix number command in global configuration mode. To remove the prefix, use the no form of this command.
pots prefix number number
no pots prefix number number
Syntax Description
number
|
Prefix, up to a maximum of five digits.
|
Command Default
No prefix is associated with the called number for analog or modem calls
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.2(2)T
|
This command was introduced on the Cisco 803 and Cisco 804.
|
Usage Guidelines
Only one prefix can be configured using this command. If a prefix already exists, the next prefix configured with this command overwrites the old prefix. Prefixes can be of variable length, up to five digits. The no pots prefix number command removes the prefix.
As numbers are dialed on the keypad, a comparison is made to the configured prefix filter. When a match is determined, the number is dialed without adding the prefix. In the unlikely event that the prefix filter has more digits than the dialed number, and the dialed number matches the first digits of the prefix filter, the prefix is not added to the dialed number. For example, if the prefix filter is 5554000 and you dial 555 and stop, the router considers the called number to be 555 and does not add a prefix to the number. This event is unlikely to occur because the number of digits in dialed numbers is typically greater than the number of digits in prefix filters.
Examples
The following example sets the prefix to 12345:
This prefix is added to any number dialed for analog or modem calls that do not match the prefix filter.
Related Commands
Command
|
Description
|
pots prefix filter
|
Sets a filter that prevents a dial prefix from being added to a dialed number when the digits in the dialed number match the filter.
|
pots ringing-freq
To specify the frequency on the Cisco 800 series router at which connected telephones, fax machines, or modems ring, use the pots ringing-freq command in global configuration mode. To disable the specified frequency, use the no form of this command.
pots ringing-freq {20Hz | 25Hz | 50Hz}
no pots ringing-freq {20Hz | 25Hz | 50Hz}
Syntax Description
20Hz
|
Connected devices ring at 20 Hz.
|
25Hz
|
Connected devices ring at 25 Hz.
|
50Hz
|
Connected devices ring at 50 Hz.
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Examples
The following example sets the ringing frequency to 50 Hz:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots silence-time
To specify the interval of silence after a calling party disconnects, use the pots silence-time command in global configuration mode. To disable the specified silence time, use the no form of this command.
pots silence-time interval
no pots silence-time interval
Syntax Description
interval
|
Number from 0 to 10 (seconds).
|
Command Default
The default depends on the setting of the pots country command. For more information, see the pots country command.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
Examples
The following example sets the interval of silence to 10 seconds:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic.
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots tone-source
|
Specifies the source of dial, ringback, and busy tones for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pots tone-source
To specify the source of dial, ringback, and busy tones for your connected telephones, fax machines, or modems, use the pots tone-source command in global configuration mode. To disable the specified source, use the no form of this command.
pots tone-source {local | remote}
no pots tone-source {local | remote}
Syntax Description
local
|
Router supplies the tones.
|
remote
|
Telephone switch supplies the tones.
|
Command Default
Local (router supplies the tones)
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.0(3)T
|
This command was introduced on the Cisco 800 series.
|
Usage Guidelines
This command applies to Cisco 800 series routers.
This command applies only to ISDN lines connected to a EURO-ISDN (NET3) switch.
Examples
The following example sets the tone source to remote:
Related Commands
Command
|
Description
|
pots country
|
Configures telephones, fax machines, or modems connected to a Cisco 800 series router to use country-specific default settings for each physical characteristic
|
pots dialing-method
|
Specifies how the Cisco 800 series router collects and sends digits dialed on your connected telephones, fax machines, or modems.
|
pots disconnect-supervision
|
Specifies how a Cisco 800 series router notifies the connected telephones, fax machines, or modems when the calling party has disconnected.
|
pots disconnect-time
|
Specifies the interval in which the disconnect method is applied if telephones, fax machines, or modems connected to a Cisco 800 series router fail to detect that a calling party has disconnected.
|
pots distinctive-ring-guard-time
|
Specifies the delay in which a telephone port can be rung after a previous call is disconnected (Cisco 800 series routers).
|
pots encoding
|
Specifies the PCM encoding scheme for telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots line-type
|
Specifies the impedance of telephones, fax machines, or modems connected to a Cisco 800 series router.
|
pots ringing-freq
|
Specifies the frequency at which telephones, fax machines, or modems connected to a Cisco 800 series router ring.
|
pots silence-time
|
Specifies the interval of silence after a calling party disconnects (Cisco 800 series router).
|
show pots status
|
Displays the settings of the telephone port physical characteristics and other information on the telephone interfaces on a Cisco 800 series router.
|
pre-dial delay
To configure a delay on an Foreign Exchange Office (FXO) interface between the beginning of the off-hook state and the initiation of dual-tone multifrequency (DTMF) signaling, use the pre-dial delay command in voice-port configuration mode. To reset to the default, use the no form of the command.
pre-dial delay seconds
no pre-dial delay
Syntax Description
seconds
|
Delay, in seconds, before signaling begins. Range is from 0 to 10. Default is 1.
|
Command Default
1 second
Command Modes
Voice-port configuration
Command History
Release
|
Modification
|
11.(7)T
|
This command was introduced on the Cisco 3600 series.
|
12.0(2)T
|
This command was integrated into Cisco IOS Release 12.0(2)T.
|
Usage Guidelines
To disable the command, set the delay to 0. When an FXO interface begins to draw loop current (off-hook state), a delay is required between the initial flow of loop current and the beginning of signaling. Some devices initiate signaling too quickly, resulting in redial attempts. This command allows a signaling delay.
Examples
The following example sets a predial delay value of 3 seconds on the FXO port:
Related Commands
Command
|
Description
|
timeouts initial
|
Configures the initial digit timeout value for a specified voice port.
|
timing delay-duration
|
Configures delay dial signal duration for a specified voice port.
|
preference (dial peer)
To indicate the preferred order of a dial peer within a hunt group, use the preference command in dial peer configuration mode. To remove the preference, use the no form of this command.
preference value
no preference
Syntax Description
value
|
Integer from 0 to 10, where the lower the number, the higher the preference. Default is 0 (highest preference).
|
Command Default
0 (highest preference)
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
11.3(1)MA
|
This command was introduced on the Cisco MC3810.
|
12.0(3)T
|
This command was integrated into Cisco IOS Release 12.0(3)T and implemented on the Cisco 2600 series and Cisco 3600 series.
|
12.0(4)T
|
This command was modified to support VoFR dial peers on the Cisco 2600 series and Cisco 3600 series.
|
Usage Guidelines
This command applies to POTS, VoIP, VoFR, and VoATM dial peers.
Use this command to indicate the preference order for matching dial peers in a rotary group. Setting the preference enables the desired dial peer to be selected when multiple dial peers within a hunt group are matched for a dial string.
Note
If POTS and voice-network peers are mixed in the same hunt group, the POTS dial peers must have priority over the voice-network dial peers.
Use this command with the Rotary Calling Pattern feature described in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2 chapter "Configuring H.323 Gateways."
The hunting algorithm precedence is configurable. For example, if you wish a call processing sequence to go to destination A first, to destination B second, and to destination C third, you would assign preference (0 being the highest priority) to the destinations in the following order:
•
Preference 0 to A
•
Preference 1 to B
•
Preference 2 to C
Examples
The following example sets POTS dial peer 10 to a preference of 1, POTS dial peer 20 to a preference of 2, and VoFR dial peer 30 to a preference of 3:
destination pattern 5550150
destination pattern 5550150
destination pattern 5550150
The following examples show different dial peer configurations:
Dialpeer destpat preference session-target
1 4085550148 0 (highest) jmmurphy-voip
3 408555 1 (lower) backup-sj-voip
4 .......... 1 0:D (interface)
5 .......... 0 anywhere-voip
If the destination number is 4085550148, the order of attempts is 1, 2, 3, 5, 4:
Dialpeer destpat preference
4 ..............4085550.........0
If the number dialed is 4085550148, the order is 2, 3, 4, 1.
Note
The default behavior is that the longest matching dial peer supersedes the preference value.
Related Commands
Command
|
Description
|
called-number (dial peer)
|
Enables an incoming VoFR call leg to get bridged to the correct POTS call leg when using a static FRF.11 trunk connection.
|
codec (dial peer)
|
Specifies the voice coder rate of speech for a Voice over Frame Relay dial peer.
|
cptone
|
Specifies a regional analog voice interface-related tone, ring, and cadence setting.
|
destination-pattern
|
Specifies the prefix, the full E.164 telephone number, or an ISDN directory number (depending on the dial plan) to be used for a dial peer.
|
dtmf-relay (Voice over Frame Relay)
|
Enables the generation of FRF.11 Annex A frames for a dial peer.
|
session protocol
|
Establishes a session protocol for calls between the local and remote routers via the packet network.
|
session target
|
Specifies a network-specific address for a specified dial peer or destination gatekeeper.
|
signal-type
|
Sets the signaling type to be used when connecting to a dial peer.
|
preemption enable
To enable preemption capability on a trunk group, use the preemption enable command in trunk group configuration mode. To disable preemption capabilities, use the no form of this command.
preemption enable
no preemption enable
Syntax Description
This command has no arguments or keywords.
Command Default
Preemption is disabled on the trunk group.
Command Modes
Trunk group configuration
Command History
Release
|
Modification
|
12.4(4)XC
|
This command was introduced.
|
12.4(9)T
|
This command was integrated into Cisco IOS Release 12.4(9)T.
|
Examples
The following command example enables preemption capabilities on trunk group test:
Router(config)# trunk group test
Router(config-trunk-group)# preemption enable
Related Commands
Command
|
Description
|
isdn integrate all
|
Enables integrated mode on an ISDN PRI interface.
|
max-calls
|
Sets the maximum number of calls that a trunk group can handle.
|
preemption guard timer
|
Defines time for a DDR call and allows time to clear the last call from the channel.
|
preemption level
|
Sets the preemption level of the selected outbound dial peer. Voice calls can be preempted by a DDR call with higher preemption level.
|
preemption tone timer
|
Defines the expiry time for the preemption tone for the outgoing call being preempted by a DDR backup call.
|
preemption guard timer
To define the time for a DDR call and to allow time to clear the last call from the channel, use the preemption guard timer command in trunk group configuration mode. To disable the preemption guard time, use the no form of this command.
preemption guard timer value
no preemption guard timer
Syntax Description
value
|
Number, in milliseconds for the preemption guard timer. The range is 60 to 500. The default is 60.
|
Command Default
No preemption guard timer is configured.
Command Modes
Trunk group configuration
Command History
Release
|
Modification
|
12.4(4)XC
|
This command was introduced.
|
12.4(9)T
|
This command was integrated into Cisco IOS Release 12.4(9)T.
|
Examples
The following set of commands configures a 60-millisecond preemption guard timer on the trunk group dial2.
Router(config)# trunk group dial2
Router(config-trunk-group)# preemption enable
Router(config-trunk-group)# preemption guard timer 60
Related Commands
Command
|
Description
|
isdn integrate all
|
Enables integrated mode on an ISDN PRI interface.
|
max-calls
|
Sets the maximum number of calls that a trunk group can handle.
|
preemption enable
|
Enables preemption capabilities on a trunk group.
|
preemption level
|
Sets the preemption level of the selected outbound dial-peer. Voice calls can be preempted by a DDR call with higher preemption level.
|
preemption tone timer
|
Sets the expiry time for the preemption tone for the outgoing call being preempted by a DDR backup call.
|
preemption level
To set the precedence for voice calls to be preempted by a dial-on demand routing (DDR) call for the trunk group, use the preemption level command in dial peer configuration mode. To restore the default preemption level setting, use the no form of this command
preemption level {flash-override | flash | immediate | priority | routine}
no preemption level
Syntax Description
flash-override
|
Sets the precedence for voice calls to preemption level 0 (highest).
|
flash
|
Sets the precedence for voice calls to preemption level 1.
|
immediate
|
Sets the precedence for voice calls to preemption level 2.
|
priority
|
Sets the precedence for voice calls to preemption level 3.
|
routine
|
Sets the precedence for voice calls to preemption level 4 (lowest). This is the default.
|
Command Default
The preemption level default is routine (lowest).
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
12.4(4)XC
|
This command was introduced.
|
12.4(9)T
|
This command was integrated into Cisco IOS Release 12.4(9)T.
|
Examples
The following command example sets a preemption level of flash (level 1) on POTS dial-peer 20:
Router(config)# dial-peer voice 20 pots
Router(config-dial-peer)# preemption level flash
Related Commands
Command
|
Description
|
dialer preemption level
|
Sets the precedence for voice calls to be preempted by a DDR call for the dialer map.
|
isdn integrate all
|
Enables integrated mode on an ISDN PRI interface.
|
max-calls
|
Sets the maximum number of calls that a trunk group can handle.
|
preemption enable
|
Enables preemption capabilities on a trunk group.
|
preemption guard timer
|
Defines time for a DDR call and allows time to clear the last call from the channel.
|
preemption tone timer
|
Defines the expiry time for the preemption tone for the outgoing call being preempted by a DDR backup call.
|
preemption tone timer
To set the expiry time for the preemption tone for the outgoing call being preempted by a DDR backup call, use the preemption tone timer command in trunk group configuration mode. To clear the expiry time, use the no form of this command.
preemption tone timer seconds
no preemption tone timer
Syntax Description
seconds
|
Length of preemption tone, in seconds. Range: 4 to 30. Default: 10.
|
Command Default
No preemption tone timer is configured.
Command Modes
Trunk group configuration
Command History
Release
|
Modification
|
12.4(4)XC
|
This command was introduced.
|
12.4(9)T
|
This command was integrated into Cisco IOS Release 12.4(9)T.
|
Examples
The following set of commands configures a 20-second preemption tone timer on trunk group dial2.
Router(config)# trunk group dial2
Router(config-trunk-group)# preemption enable
Router(config-trunk-group)# preemption tone timer 20
Related Commands
Command
|
Description
|
isdn integrate all
|
Enables integrated mode on an ISDN PRI interface.
|
max-calls
|
Sets the maximum number of calls that a trunk group can handle.
|
preemption enable
|
Enables preemption capabilities on a trunk group.
|
preemption level
|
Sets the preemption level of the selected outbound dial peer. Voice calls can be preempted by a DDR call with higher preemption level.
|
prefix
To specify the prefix of the dialed digits for a dial peer, use the prefix command in dial peer configuration mode. To disable this feature, use the no form of this command.
prefix string
no prefix
Syntax Description
string
|
Integers that represent the prefix of the telephone number associated with the specified dial peer. Valid values are 0 through 9 and a comma (,). Use a comma to include a pause in the prefix.
|
Command Default
Null string
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
11.3(1)T
|
This command was introduced on the Cisco 3600 series.
|
12.0(4)XJ
|
This command was implemented on the Cisco AS5300. It and modified for store-and-forward fax.
|
12.1(1)T
|
This command was integrated into Cisco IOS Release 12.1(1)T.
|
12.2(4)T
|
This command was implemented on the Cisco 1750.
|
12.2(8)T
|
This command was implemented on the following platforms: Cisco 1751, Cisco 2600 series, Cisco 3600 series, Cisco 3725, and Cisco 3745.
|
12.2(13)T
|
This command was supported in Cisco IOS Release 12.2(13)T and implemented on the Cisco 2600XM, Cisco ICS7750, and Cisco VG200.
|
Usage Guidelines
Use this command to specify a prefix for a specific dial peer. When an outgoing call is initiated to this dial peer, the prefix string value is sent to the telephony interface first, before the telephone number associated with the dial peer.
If you want to configure different prefixes for dialed numbers on the same interface, you need to configure different dial peers.
This command is applicable only to plain old telephone service (POTS) dial peers. This command applies to off-ramp store-and-forward fax functions.
Examples
The following example specifies a prefix of 9 and then a pause:
The following example specifies a prefix of 5120002:
Router(config-dial-peer)# prefix 5120002
Related Commands
Command
|
Description
|
answer-address
|
Specifies the full E.164 telephone number to be used to identify the dial peer of an incoming call.
|
destination-pattern
|
Specifies either the prefix or the full E.164 telephone number to be used for a dial peer.
|
prefix (Annex G)
To restrict the prefixes for which the gatekeeper should query the Annex G border element (BE), use the prefix command in gatekeeper border element configuration mode.
prefix prefix* [seq | blast]
Syntax Description
prefix*
|
Prefix for which BEs should be queried.
|
seq
|
(Optional) Queries are sent out to the neighboring BEs sequentially.
|
blast
|
(Optional) Queries are sent out to the neighboring BEs simultaneously.
|
Command Default
Any time a remote zone query occurs, the BE is also queried.
Command Modes
Gatekeeper border element configuration
Command History
Release
|
Modification
|
12.2(2)XA
|
This command was introduced.
|
12.2(4)T
|
This command was integrated into Cisco IOS Release 12.2(4)T. Support for the Cisco AS5300, Cisco AS5350, and Cisco AS5400 is not included in this release.
|
12.2(2)XB1
|
This command was implemented on the Cisco AS5850.
|
12.2(11)T
|
This command was integrated into Cisco IOS Release 12.2(11)T.
|
Usage Guidelines
By default, the gatekeeper sends all remote zone requests to the BE. Use this command only if you want to restrict the queries to the BE to a specific prefix or set of prefixes.
Examples
The following example directs the gatekeeper to query the BE using a prefix of 408.
Router(config-gk-annexg)# prefix 408* seq
Related Commands
Command
|
Description
|
h323-annexg
|
Enables the BE on the gatekeeper and enters border element configuration mode.
|
prefix (stcapp-fac)
To designate a prefix string to precede the dialing of SCCP telephony control (STC) feature access codes, use the prefix command in STC application feature access-code configuration mode. To return the prefix to its default, use the no form of this command.
prefix prefix-string
no prefix
Syntax Description
prefix-string
|
String of one to ten characters that can be dialed on a telephone keypad. String must start with * (asterisk) or # (pound sign). Default is **.
|
Command Default
The default prefix is ** (two asterisks).
Command Modes
STC application feature access-code configuration
Command History
Release
|
Modification
|
12.4(2)T
|
This command was introduced.
|
Usage Guidelines
This command is used with the STC application, which enables certain features on analog FXS endpoints that use Skinny Client Control Protocol (SCCP) for call control. Phone users dial the feature access code (FAC) prefix string before dialing a FAC that activates a feature. For example, to set call forwarding for all calls using the default prefix and FAC, a phone user dials **1.
Use this command only if you want to change the prefix from its default (**).
The show running-config command displays nondefault FACs and prefixes only. The show stcapp feature codes command displays all FACs and prefixes.
Examples
The following example sets a FAC prefix of two pound signs (##). After this value is configured, a phone user dials ##2 on the keypad to forward all calls for that extension.
Router(config)# stcapp feature access-code
Router(stcapp-fac)# prefix ##
Router(stcapp-fac)# call forward all 2
Router(stcapp-fac)# call forward cancel 3
Router(stcapp-fac)# pickup local 6
Router(stcapp-fac)# pickup group 5
Router(stcapp-fac)# pickup direct 4
Related Commands
Command
|
Description
|
call forward all
|
Designates an STC application feature access code to activate the forwarding of all calls.
|
call forward cancel
|
Designates an STC application feature access code to cancel the forwarding of all calls.
|
pickup direct
|
Designates an STC application feature access code for directed call pickup.
|
pickup group
|
Designates an STC application feature access code for group call pickup from another group.
|
pickup local
|
Designates an STC application feature access code for group call pickup from the local group.
|
show running-config
|
Displays current nondefault configuration settings.
|
show stcapp feature codes
|
Displays configured and default STC application feature access codes.
|
stcapp feature access-code
|
Enters STC application feature access-code configuration mode to set feature access codes.
|
prefix (stcapp-fsd)
To designate a prefix string to precede the dialing of SCCP telephony control (STC) application feature speed-dial codes, use the prefix command in STC application feature speed-dial configuration mode. To return the prefix to its default, use the no form of this command.
prefix prefix-string
no prefix
Syntax Description
prefix-string
|
String of one to ten characters that can be dialed on a telephone keypad. String must start with * (asterisk) or # (pound sign). Default is *.
|
Command Default
The default prefix is * (one asterisk).
Command Modes
STC application feature speed-dial configuration
Command History
Release
|
Modification
|
12.4(2)T
|
This command was introduced.
|
Usage Guidelines
This command is used with the STC application, which enables certain features on analog FXS endpoints that use Skinny Client Control Protocol (SCCP) for call control. Phone users dial the feature speed-dial (FSD) prefix string before dialing an FSD code that dials a telephone number. For example, to dial the telephone number that is stored in speed-dial position 2, a phone user dials *2.
Use this command only if you want to change the prefix from its default (*).
The show running-config command displays nondefault FSDs and prefixes only. The show stcapp feature codes command displays all feature speed-dial FSDs and prefixes.
Examples
The following example sets an FSD prefix of three asterisks (***). After this value is configured, a phone user presses ***2 on the keypad to dial speed-dial number 2.
Router(config)# stcapp feature speed-dial
Router(stcapp-fsd)# prefix ***
Router(stcapp-fsd)# speed dial from 2 to 7
Router(stcapp-fsd)# redial 9
Router(stcapp-fsd)# voicemail 8
Related Commands
Command
|
Description
|
redial
|
Designates an STC application feature speed-dial code to dial again the last number that was dialed.
|
show stcapp feature codes
|
Displays configured and default STC application feature access codes.
|
speed dial
|
Designates a range of STC application feature speed-dial codes.
|
stcapp feature speed-dial
|
Enters STC application feature speed-dial configuration mode to set feature speed-dial codes.
|
voicemail (stcapp-fsd)
|
Designates an STC application feature speed-dial code to dial the voice-mail number.
|
presence
To enable presence service and enter presence configuration mode, use the presence command in global configuration mode. To disable presence service, use the no form of this command.
presence
no presence
Syntax Description
This command has no arguments or keywords.
Command Default
Presence service is disabled.
Command Modes
Global configuration
Command History
Release
|
Modification
|
12.4(11)XJ
|
This command was introduced.
|
Usage Guidelines
This command enables the router to perform the following presence functions:
•
Process presence requests from internal lines to internal lines. Notify internal subscribers of any status change.
•
Process incoming presence requests from a SIP trunk for internal lines. Notify external subscribers of any status change.
•
Send presence requests to external presentities on behalf of internal lines. Relay status responses to internal lines.
Examples
The following example shows how to enable presence and enter presence configuration mode to set the maximum subscriptions to 150:
Router(config-presence)# max-subscription 150
Related Commands
Command
|
Description
|
allow watch
|
Allows a directory number on a phone registered to Cisco Unified CME to be watched in a presence service.
|
debug presence
|
Displays debugging information about the presence service.
|
max-subscription
|
Sets the maximum number of concurrent watch sessions that are allowed.
|
presence enable
|
Allows the router to accept incoming presence requests.
|
server
|
Specifies the IP address of a presence server for sending presence requests from internal watchers to external presence entities.
|
show presence global
|
Displays configuration information about the presence service.
|
show presence subscription
|
Displays information about active presence subscriptions.
|
presence call-list
To enable Busy Lamp Field (BLF) monitoring for call lists and directories on phones registered to the Cisco Unified CME router, use the presence call-list command in ephone, presence, or voice register pool configuration mode. To disable BLF indicators for call lists, use the no form of this command.
presence call-list
no presence call-list
Syntax Description
This command has no arguments or keywords.
Command Default
BLF monitoring for call lists is disabled.
Command Modes
Ephone configuration
Presence configuration
Voice register pool configuration
Command History
Cisco IOS Release
|
Cisco Product
|
Modification
|
12.4(11)XJ
|
Cisco Unified CME 4.1
|
This command was introduced.
|
Usage Guidelines
This command enables a phone to monitor the line status of directory numbers listed in a directory or call list, such as a missed calls, placed calls, or received calls list. Using this command in presence mode enables the BLF call-list feature for all phones. To enable the feature for an individual SCCP phone, use this command in ephone configuration mode. To enable the feature for an individual SIP phone, use this command in voice register pool configuration mode.
If this command is disabled globally and enabled in voice register pool or ephone configuration mode, the feature is enabled for that voice register pool or ephone.
If this command is enabled globally, the feature is enabled for all voice register pools and ephones regardless of whether it is enabled or disabled on a specific voice register pool or ephone.
To display a BLF status indicator, the directory number associated with a telephone number or extension must have presence enabled with the allow watch command.
For information on the BLF status indicators that display on specific types of phones, see the Cisco Unified IP Phone documentation for your phone model.
Examples
The following example shows the BLF call-list feature enabled for ephone 1. The line status of a directory number that appears in a call list or directory is displayed on phone 1 if the directory number has presence enabled.
Router(config-ephone)# presence call-list
Related Commands
Command
|
Description
|
allow watch
|
Allows a directory number on a phone registered to Cisco Unified CME to be watched in a presence service.
|
blf-speed-dial
|
Enables BLF monitoring for a speed-dial number on a phone registered to Cisco Unified CME.
|
presence
|
Enables presence service and enters presence configuration mode.
|
show presence global
|
Displays configuration information about the presence service.
|
presence enable
To allow incoming presence requests, use the presence enable command in SIP UA configuration mode. To block incoming requests, use the no form of this command.
presence enable
no presence enable
Syntax Description
This command has no arguments or keywords.
Command Default
Incoming presence requests are blocked.
Command Modes
SIP UA configuration
Command History
Release
|
Modification
|
12.4(11)XJ
|
This command was introduced.
|
Usage Guidelines
This command allows the router to accept incoming presence requests (SUBSCRIBE messages) from internal watchers and SIP trunks. It does not impact outgoing presence requests.
Examples
The following example shows how to allow incoming presence requests:
Router(config-sip-ua)# presence enable
Related Commands
Command
|
Description
|
allow subscribe
|
Allows internal watchers to monitor external presence entities (directory numbers).
|
allow watch
|
Allows a directory number on a phone registered to Cisco Unified CME to be watched in a presence service.
|
max-subscription
|
Sets the maximum number of concurrent watch sessions that are allowed.
|
show presence global
|
Displays configuration information about the presence service.
|
show presence subscription
|
Displays information about active presence subscriptions.
|
watcher all
|
Allows external watchers to monitor internal presence entities (directory numbers).
|
pri-group (pri-slt)
To specify an ISDN PRI on a channelized T1 or E1 controller, use the pri-group (pri-slt) command in controller configuration mode. To remove the ISDN PRI configuration, use the no form of this command.
pri-group [timeslots timeslot-range [nfas_d [backup | none | primary [nfas_int number]]
[nfas-group number [iua as-name]]]
no pri-group
Syntax Description
timeslots timeslot-range
|
Specifies a single range of timeslot values in the PRI goup. For T1, the allowable range is from 1 to 23. For E1, the allowable range is from 1 to 31.
|
nfas_d
|
Specifies the operation of the D channel timeslot.
|
backup
|
(Optional) Specifes that the operation of the D channel timeslot on this controller is the NFAS D backup.
|
none
|
(Optional) Specifes that the D channel timeslot is used as an additional B channel.
|
primary
|
Specifies that the D channel timeslot on this controller in NFAS D.
|
nfas_int range
|
Specifies the provisioned NFAS interface value. Valid values range from 0 to 32.
|
nfas-group number
|
Specifies the NFAS group and the NFAS group number. Valid values range from 0 to 31.
|
iua as-name
|
Binds the Non-Facility Associated Signaling (NFAS) group to the IDSN User Adaptation Layer (IUA) application server (AS).
|
Command Default
No ISDN-PRI group is configured.
Command Modes
Controller configuration
Command History
Release
|
Modification
|
12.2(11)T
|
This command was introduced.
|
12.2(15)T
|
This command was integrated on the Cisco 2420, Cisco 2600 series, Cisco 3600 series, and Cisco 3700 series; and Cisco AS5300, Cisco AS5350, Cisco AS5400, and Cisco AS5850 network access server (NAS) platforms.
|
Usage Guidelines
The pri-group (pri-slt) command provides another way to bind a D channel to a specific IUA AS. This option allows the RLM group to be configured at the pri-group level instead of in the D channel configuration. For example, a typical configuration would look like the following:
pri-group timeslots 1-24 nfas_d pri nfas_int 0 nfas_group 1 iua asname
Before you enter the pri-group command, you must specify an ISDN-PRI switch type and an E1 or T1 controller.
When configuring NFAS, you use an extended version of the pri-group command to specify the following values for the associated channelized T1 controllers configured for ISDN:
•
The range of PRI timeslots to be under the control of the D channel (timeslot 24).
•
The function to be performed by timeslot 24 (primary D channel, backup, or none); the latter specifies its use as a B channel.
•
The group identifier number for the interface under the control of a particular D channel.
The iua keyword is used to bind an NFAS group to the IUA AS.
When binding the D channel to an IUA AS, the as-name must match the name of an AS set up during IUA configuration.
Before you can modify a PRI group on a Media Gateway Controller (MGC), you must first shut down the D channel.
The following shows how to shut down the D channel:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface Dchannel3/0:1
Router(config-if)# shutdown
Examples
The following example configures the NFAS primary D channel on one channelized T1 controller, and binds the D channel to an IUA AS. This example uses the Cisco AS5400 and applies to T1, which has 24 timeslots and is used mainly in North America and Japan:
Router(config-controller)# pri-group timeslots 1-23 nfas-d primary nfas-int 0 nfas-group 1
iua as5400-4-1
The following example applies to E1, which has 32 timeslots and is used by the rest of the world:
Router(config-controller)# pri-group timeslots 1-31 nfas-d primary nfas-int 0 nfas-group 1
iua as5400-4-1
The following example configures ISDN-PRI on all time slots of controller E1:
Router(config)# controller E1 4/1
Router(config-controller)# pri-group timeslots 1-7,16
In the following example, the rlm-timeslot keyword automatically creates interface serial 4/7:11 (4/7:0:11 if you are using the CT3 card) for the D channel object on a Cisco AS5350. You can choose any timeslot other than 24 to be the virtual container for the D channel parameters for ISDN.
Router(config-controller)# pri-group timeslots 1-23 nfas-d primary nfas-int 0 nfas-group 0
rlm-timeslot 3
Related Commands
Command
|
Description
|
isdn switch-type
|
Configures the Cisco 2600 series router PRI interface to support QSIG signaling.
|
pri-group nec-fusion
To configure your NEC PBX to support Fusion Call Control Signaling (FCCS), use the pri-group nec-fusion command in controller configuration mode. To disable FCCS, use the no form of this command.
pri-group nec-fusion {pbx-ip-address | pbx-ip-host-name} pbx-port number
no pri-group nec-fusion {pbx-ip-address | pbx-ip-host-name} pbx-port number
Syntax Description
pbx-ip-address
|
IP address of the NEC PBX.
|
pbx-ip-host-name
|
Host name of the NEC PBX.
|
pbx-port number
|
Port number for the PBX. Range is from 49152 to 65535. Default is 55000. If this value is already in use, the next greater value is used.
|
Command Default
PBX port number: 55000
Command Modes
Controller configuration
Command History
Release
|
Modification
|
12.0(7)T
|
This command was introduced on the Cisco AS5300.
|
12.2(1)
|
This command was modified to add support for setup messages from a POTS dial peer.
|
Usage Guidelines
This command is used only if the PBX in your configuration is an NEC PBX, and if you are configuring it to run FCCS and not QSIG signaling.
Examples
The following example directs this NEC PBX to use FCCS:
pri-group nec-fusion 172.31.255.255 pbx-port 60000
Related Commands
Command
|
Description
|
isdn protocol-emulate
|
Configures the Layer 2 and Layer 3 port protocol of a BRI voice port or a PRI interface to emulate NT (network) or TE (user) functionality.
|
isdn switch type
|
Configures the Cisco AS5300 universal access server PRI interface to support QSIG signaling.
|
show cdapi
|
Displays the CDAPI.
|
show rawmsg
|
Displays the raw messages owned by the required component.
|
pri-group timeslots
To specify an ISDN PRI group on a channelized T1 or E1 controller, and to release the ISDN PRI signaling time slot, use the pri-group timeslots command in controller configuration mode. To remove or change the ISDN PRI configuration, use the no form of this command.
pri-group timeslots timeslot-range [nfas_d {backup | none | primary {nfas_int number |
nfas_group number | rlm-group number}} | service]
no pri-group timeslots timeslot-range [nfas_d {backup | none | primary {nfas_int number |
nfas_group number | rlm-group number}} | service]
Syntax Description
timeslot-range
|
A value or range of values for time slots on a T1 or E1 controller that consists of an ISDN PRI group. Use a hyphen to indicate a range.
Note Groups of time slot ranges separated by commas (1-4,8-23 for example) are also accepted.
|
nfas_d {backup | none | primary}
|
(Optional) Configures the operation of the ISDN PRI D channel.
• backup—The D-channel time slot is used as the Non-Facility Associated Signaling (NFAS) D backup.
• none—The D-channel time slot is used as an additional B channel.
• primary—The D-channel time slot is used as the NFAS D primary. The primary keyword requires further interface and group configuration:
|
primary {nfas_int number | nfas_group number | rlm-group number}
|
– nfas_int number—Specifies the provisioned NFAS interface as a value; value is a number from 0 to 8.
– nfas_group number—Specifies the NFAS group.
– rlm-group number—Specifies the Redundant Link Manager (RLM) group and releases the ISDN PRI signaling channel.
|
service
|
(Optional) Configures service type mgcp for Media Gateway Control Protocol service.
|
Command Default
No ISDN PRI group is configured. The switch type is automatically set to the National ISDN switch type (primary-ni keyword) when the pri-group timeslots command is configured with the rlm-group subkeyword.
Command Modes
Controller configuration
Command History
Release
|
Modification
|
11.0
|
This command was introduced.
|
11.3
|
This command was enhanced to support NFAS.
|
12.0(2)T
|
This command was implemented on the Cisco MC3810 multiservice concentrator.
|
12.0(7)XK
|
This command was implemented on the Cisco 2600 and Cisco 3600 series routers.
|
12.1(2)T
|
The modifications in Cisco IOS Release 12.0(7)XK were integrated into Cisco IOS Release 12.1(2)T.
|
12.2(8)B
|
This command was modified with the rlm-group subkeyword to support release of the ISDN PRI signaling channels.
|
12.2(15)T
|
The modifications in Cisco IOS Release 12.2(8)B were integrated into Cisco IOS Release 12.2(15)T.
|
Usage Guidelines
The pri-group command supports the use of DS0 time slots for Signaling System 7 (SS7) links, and therefore the coexistence of SS7 links and PRI voice and data bearer channels on the same T1 or E1 span. In these configurations, the command applies to voice applications.
In SS7-enabled Voice over IP (VoIP) configurations when an RLM group is configured, High-Level Data Link Control (HDLC) resources allocated for ISDN signaling on a digital subscriber line (DSL) interface are released and the signaling slot is converted to a bearer channel (B24). The D channel will be running on IP. The chosen D-channel time slot can still be used as a B channel by using the isdn rlm-group interface configuration command to configure the NFAS groups.
NFAS allows a single D channel to control multiple PRI interfaces. Use of a single D channel to control multiple PRI interfaces frees one B channel on each interface to carry other traffic. A backup D channel can also be configured for use when the primary NFAS D channel fails. When a backup D channel is configured, any hard system failure causes a switchover to the backup D channel and currently connected calls remain connected.
NFAS is supported only with a channelized T1 controller and, as a result, must be ISDN PRI capable. Once the channelized T1 controllers are configured for ISDN PRI, only the NFAS primary D channel must be configured; its configuration is distributed to all members of the associated NFAS group. Any configuration changes made to the primary D channel will be propagated to all NFAS group members. The primary D channel interface is the only interface shown after the configuration is written to memory.
The channelized T1 controllers on the router must also be configured for ISDN. The router must connect to either an AT&T 4ESS, Northern Telecom DMS-100 or DMS-250, or National ISDN switch type.
The ISDN switch must be provisioned for NFAS. The primary and backup D channels should be configured on separate T1 controllers. The primary, backup, and B-channel members on the respective controllers should be the same configuration as that configured on the router and ISDN switch. The interface ID assigned to the controllers must match that of the ISDN switch.
You can disable a specified channel or an entire PRI interface, thereby taking it out of service or placing it into one of the other states that is passed in to the switch using the isdn service interface configuration command.
In the event that a controller belonging to an NFAS group is shut down, all active calls on the controller that is shut down will be cleared (regardless of whether the controller is set to primary, backup, or none), and one of the following events will occur:
•
If the controller that is shut down is configured as the primary and no backup is configured, all active calls on the group are cleared.
•
If the controller that is shut down is configured as the primary, and the active (In service) D channel is the primary and a backup is configured, then the active D channel changes to the backup controller.
•
If the controller that is shut down is configured as the primary, and the active D channel is the backup, then the active D channel remains as backup controller.
•
If the controller that is shut down is configured as the backup, and the active D channel is the backup, then the active D channel changes to the primary controller.
The expected behavior in NFAS when an ISDN D channel (serial interface) is shut down is that ISDN Layer 2 should go down but keep ISDN Layer 1 up, and that the entire interface will go down after the amount of seconds specified for timer T309.
Note
The active D channel changeover between primary and backup controllers happens only when one of the link fails and not when the link comes up. The T309 timer is triggered when the changeover takes place.
Examples
The following example configures T1 controller 1/0 for PRI and for the NFAS primary D channel. This primary D channel controls all the B channels in NFAS group 1.
pri-group timeslots 1-24 nfas_d primary nfas_int 0 nfas_group 1
The following example specifies ISDN PRI on T1 slot 1, port 0, and configures voice and data bearer capability on time slots 2 through 6:
isdn switch-type primary-4ess
The following example configures a standard ISDN PRI interface:
! Standard PRI configuration:
pri-group timeslots 1-23 nfas_d primary nfas_int 0 nfas_group 0
! Standard ISDN serial configuration:
The following example configures a dedicated T1 link for SS7-enabled VoIP:
pri-group timeslots 1-23 nfas_d primary nfas_int 0 nfas_group 0
! In a dedicated configuration, we assume the 24th timeslot will be used by ISDN.
! Serial interface 0:23 is created for configuring ISDN parameters.
! The D channel is on the RLM.
The following example configures a shared T1 link for SS7-enabled VoIP. The rlm-group 0 portion of the pri-group timeslots command releases the ISDN PRI signaling channel.
pri-group timeslots 1-3 nfas_d primary nfas_int 0 nfas_group 0 rlm-group 0
channel group 23 timeslot 24
! D-channel interface is created for configuration of ISDN parameters:
Related Commands
Command
|
Description
|
controller
|
Configures a T1 or E1 controller and enters controller configuration mode.
|
interface Dchannel
|
Specifies an ISDN D-channel interface for VoIP applications that require release of the ISDN PRI signaling time slot for RLM configurations.
|
interface serial
|
Specifies a serial interface created on a channelized E1 or channelized T1 controller for ISDN PRI signaling.
|
isdn rlm-group
|
Specifies the RLM group number that ISDN will start using.
|
isdn switch-type
|
Specifies the central office switch type on the ISDN PRI interface.
|
isdn timer t309
|
Changes the value of the T309 timer to clear network connections and release the B channels when there is no signaling channel active, that is, when the D channel has failed and cannot recover by switching to an alternate D channel. Calls remain active and able to transfer data when the D channel fails until the T309 timer expires. The T309 timer is canceled when D-channel failover succeeds.
|
show isdn nfas group
|
Displays all the members of a specified NFAS group or all NFAS groups.
|
privacy
To set privacy support as defined in RFC 3323, use the privacy command in voice-service voip-sip configuration mode or on a dial peer. To remove privacy support as defined in RFC 3323, use the no form of this command.
privacy [[[header | session | user | id] | critical] | pstn | system | disable]
no privacy
Syntax Description
header
|
(Optional) Requests that privacy services enforce privacy for all the headers in the SIP message which might identify information about the subscriber.
|
session
|
(Optional) Requests that the information held in the session description (SDP) is hidden outside the trust domain.
|
user
|
(Optional) Requests that privacy services provide a user-level privacy function.
|
id
|
(Optional) Requests the Network Asserted Identity that authenticated the user be kept private with respect to SIP entities outside the trusted domain.
|
critical
|
(Optional) Requests privacy service must perform the specified service or fail the request. Valid option only when you select header, session, user, or id.
|
pstn
|
(Optional) Requests that the privacy service implements a privacy header based on information in OCtet 3a. When selected, this becomes the only valid option.
|
system
|
(Optional) Enables the privacy service globally.
|
disable
|
(Optional) Disables the privacy service regardless of prior implementations.
|
Command Default
The command is disabled.
Command Modes
Voice-service sip configuration (conf-serv-sip)
Dial-peer configuration (config-dial-peer)
Command History
Release
|
Modification
|
12.4(15)T
|
This command was introduced.
|
Usage Guidelines
Use the privacy command to instruct the gateway to add a Proxy-Require header set to a value supported by RFC 3323 in outgoing SIP request messages.
Use the privacy critical command to instruct the gateway to add a Proxy-Require header with the value set to critical. In the unlikely event a user agent sends a request to an intermediary that does not support privacy extensions, the request fails.
Examples
The following example shows how to set the privacy to PSTN.
Router# configure terminal
Router(config)# voice service voip
Router(conf-voi-serv)# sip
Router(conf-serv-sip)# privacy pstn
Related Commands
Command
|
Description
|
asserted-id
|
Sets the privacy level and enables either P-Asserted-Identity (PAI) or P-Preferred-Identity (PPI) privacy headers in outgoing SIP requests or response messages.
|
calling-info pstn-to-sip
|
Specifies calling information treatment for PSTN-to-SIP calls.
|
clid (voice-service-voip)
|
Passes the network-provided ISDN numbers in an ISDN calling party information element screening indicator field, removes the calling party name and number from the calling-line identifier in voice service voip configuration mode, or allows a presentation of the calling number by substituting for the missing Display Name field in the Remote-Party-ID and From headers.
|
progress_ind
To set a specific progress indicator (PI) in call setup, progress, or connect messages from an H.323 VoIP gateway, use the progress_ind command in dial peer configuration mode. To reset to the default, use the no or disable forms of this command.
progress_ind {setup | connect | progress | alert} {enable pi-number | disable}
no progress_ind {setup | connect | progress | alert}
Note
This command is not supported on VoIP gateways using Session Initiation Protocol (SIP).
Syntax Description
setup
|
Sets the progress indicator for setup messages.
|
connect
|
Sets the progress indicator for connect messages.
|
progress
|
Sets the progress indicator for progress messages.
|
alert
|
Sets the progress indicator for alert messages.
|
enable pi-number
|
Progress indicator that is sent in all messages of the specified type from the outbound dial peer. For setup messages from POTS or VoIP dial peers, values are 0, 1, or 3. For progress, connect, or alert messages from a POTS dial peer, values are 1, 2, or 8.
|
disable
|
Disables the user configuration of the progress indicator.
|
Command Default
The default progress indicator from the switch is not intercepted or modified.
Command Modes
Dial peer configuration
Command History
Release
|
Modification
|
12.1(3)XI
|
This command was introduced on the following platforms: Cisco 2600 series, Cisco 3600 series, Cisco 7200 series, Cisco 7500 series, Cisco MC3810, Cisco AS5300, and Cisco AS5800.
|
12.1(5)T
|
This command was integrated into Cisco IOS Release 12.1(5)T.
|
12.2(1)
|
This command was modified to add support for setup messages from a POTS dial peer.
|
12.2(2)XA
|
This command was implemented on the Cisco AS5350 and Cisco AS5400.
|
12.2(2)XB1
|
This command was implemented on the Cisco AS5850.
|
12.2(11)T
|
This command was integrated into Cisco IOS Release 12.2(11)T.
|
Usage Guidelines
This command overrides the default progress indicator that is sent by the switch. This enables you to set the progress indicator at the H.323 gateway, if necessary, to ensure the proper end-to-end signaling for VoIP calls. This command sets the progress indicator only in messages from outbound dial peers that have a set destination pattern, configured by using the destination-pattern command. If a message contains multiple progress indicators, the progress_ind command overrides only the first progress indicator in the message.
The disable and no forms of the progress_ind command have the same result: The call messages are not intercepted by the session application, and the default progress indicator, if any, is forwarded unmodified.
Note
A progress indicator that is configured by using the progress_ind command does not override the default progress indicator in a Progress message, if the Progress message is sent after backward cut-through has occurred (for example, because an Alert message with a progress indicator of 8 was sent before the Progress message).
Examples
The following example sets the progress indicator to 1 in progress and connect messages from POTS dial peer 3:
destination-pattern 55275
progress_ind progress enable 1
progress_ind connect enable 1
Related Commands
Command
|
Description
|
destination-pattern
|
Specifies the telephone number that is used to identify the outbound dial peer for the call.
|
dial-peer voice
|
Enters dial peer configuration mode and configures a VoIP or POTS dial peer.
|
protocol rlm port
To configure the RLM port number, use the protocol rlm port RLM configuration command. To disable this function, use the no form of this command.
protocol rlm port port-number
no protocol rlm port port-number
Syntax Description
port-number
|
RLM port number. See Table 30 for the port number choices.
|
Command Default
3000
Command Modes
RLM configuration
Command History
Release
|
Modification
|
11.3(7)
|
This command was introduced.
|
Usage Guidelines
The port number for the basic RLM connection can be reconfigured for the entire RLM group. Table 30 lists the default RLM port numbers.
Table 30 Default RLM Port Number
Protocol
|
Port Number
|
RLM
|
3000
|
ISDN
|
Port[RLM]+1
|
Related Commands
Command
|
Description
|
clear interface
|
Resets the hardware logic on an interface.
|
clear rlm group
|
Clears all RLM group time stamps to zero.
|
interface
|
Defines the IP addresses of the server, configures an interface type, and enters interface configuration mode.
|
link (RLM)
|
Specifies the link preference.
|
retry keepalive
|
Allows consecutive keepalive failures a certain amount of time before the link is declared down.
|
server (RLM)
|
Defines the IP addresses of the server.
|
show rlm group statistics
|
Displays the network latency of the RLM group.
|
show rlm group status
|
Displays the status of the RLM group.
|
show rlm group timer
|
Displays the current RLM group timer values.
|
shutdown (RLM)
|
Shuts down all of the links under the RLM group.
|
timer
|
Overwrites the default setting of timeout values.
|
proxy h323
To enable the proxy feature on your router, use the proxy h323 command in global configuration mode. To disable the proxy feature, use the no form of this command.
proxy h323
no proxy h323
Syntax Description
This command has no arguments or keywords.
Command Default
Disabled
Command Modes
Global configuration
Command History
Release
|
Modification
|
11.3(2)NA
|
This command was introduced on the Cisco 2500 series and Cisco 3600 series.
|
Usage Guidelines
If the multimedia interface is not enabled using this command or if no gatekeeper is available, starting the proxy allows it to attempt to locate these resources. No calls are accepted until the multimedia interface and the gatekeeper are found.
Examples
The following example turns on the proxy feature: