Configuring SIP Stacks

Viewing and Editing General Settings for SIP Stacks

Procedure

Step 1

Choose Configure > SIP Stack > General Settings.

The system displays the SIP Stack Settings page with the SIP General Settings tab highlighted. It lists the general SIP settings.

Step 2

Update the values as described in the section SIP Stack General Settings.

Step 3

Click Update.

SIP Stack General Settings

Table 1. SIP Stack General Settings

Parameter

Description

SIP Message

SIP Header Compaction

Whether or not to enable SIP header compaction.

When enabled, compact header forms are used for the following SIP headers:

  • Call-ID

  • Contact

  • Content-Encoding

  • Content-Length

  • Content-Type

  • From

  • Subject

  • To

  • Via

When header compaction is disabled, complete SIP headers are used in all outgoing messages, regardless of the header format.

SIP Message Logging

Whether or not to enable the logging of all incoming and outgoing SIP messages.

We recommend that you use the SIP Message Logging under SIP Stack General Settings to log messages without impacting the CUSP performance.

SIP Statistics

Whether to display statistics for active SIP queues.

Period Time

(Optional, only available if you check Configuring SIP Stacks) Determines how often to collect the peg-logging statistics.

Reset Time

(Optional, only available if you check Configuring SIP Stacks) Determines how often to reset the peg-logging statistics.

Max Forwards

Specifies the maximum number of times that a request can be forwarded to another server. Each time a request is received by a server, this value is decremented by one. (If the request does not have a Max Forwards header, one is added.) When the value reaches zero, the server responds with a 483 (too many hops) response and terminates the transaction.

You can use the Max Forwards header field to detect forwarding loops within a network.

The allowed values are 0 to 255. The default value is 70.

Note 

We recommend that you set this command to a value greater than or equal to 10, and less than or equal to 100.

Overload

Reject

Configures the server to send a 503 (Server Unavailable) response when the server is overloaded.

Retry After

(Optional, only available if you choose Reject)

The number of seconds sent in the SIP Retry-After header field of the 503 (Server Unavailable) response, which indicates when the sender can attempt the transaction again. If not specified, the 503 (Server Unavailable) response does not contain a Retry-After header field. The minimum value allowed is 0. The default value is 0.

Redirect

Configures the server to send a 300 (Redirect) response when the server is overloaded.

IP Address

(Optional, only available if you choose Redirect)

The redirect interface host name or IP address sent in the SIP Contact header field. Subsequent requests will be redirected to the server at this address.

Port

(Optional, only available if you choose Redirect)

The port of the redirect host. The valid range is from 1024 to 65535. The default is 5060.

Transport Type

(Optional, only available if you choose Redirect) The transport protocol used by the redirect host. Can be UDP, TCP, or TLS.

DNS Settings

DNS SRV Lookups

Configures SIP DNS SRV lookup commands.

DNS NAPTR Lookups

Enables the use of DNS NAPTR for domain hostname/IP address mapping.

TCP Settings

Idle Connection Timeout

Configures the amount of idle time that is allowed to pass before sending a keep-alive probe.

Maximum Connections

Configures the maximum number of TCP/TLS connections. When the maximum number of TCP/TLS connections is reached, passive (incoming) connections are not accepted, and additional active (outgoing) connections can be made.

TLS Settings

TLS Settings

Enables the use of SIP Transport Layer Security (TLS) connections with other SIP entities, providing secure communication over the Internet.

TLS Versions 1.0, 1.1, and 1.2 can be enabled or disabled.

Adding and Deleting an Alias FQDN

Procedure

Step 1

Choose Configure > SIP Stack > Alias FQDNs.

The system displays the Alias FQDNs page with the Alias FQDNs tab highlighted.

Step 2

To add an alias FQDN, do the following:

  1. Enter a name.

  2. Click Add Alias.

Step 3

To delete an alias FQDN, do the following:

  1. Check the check box next to the name of the alias FQDN to delete.

  2. Click Remove.

Adding and Deleting a Trusted Peer

This procedure creates one or more SIP TLS trusted peers. The establishment of TLS connections fails unless the identity of the remote side matches the identifier of a configured trusted peer. If there are no trusted peers configured, the connection is accepted as long as the TLS handshake succeeds.

Procedure

Step 1

Choose Configure > SIP Stack > TLS Trusted Peers.

The system displays the TLS Trusted Peers page with the TLS Trusted Peers tab highlighted.

Step 2

To add a TLS trusted peer, do the following:

  1. Enter a name.

  2. Click Add Trusted Peer.

Step 3

To delete a TLS trusted peer, do the following:

  1. Check the check box next to the name of the TLS trusted peer to delete.

  2. Click Remove.