Matching Inbound Dial Peers by URI

The Matching Inbound Dial Peers by URI feature allows you to configure the selection of inbound dial peers by matching parts of the URI sent by a remote (neighboring) SIP entity. The match can be done on different parts of the URI like hostname, IP address, DNS name. This feature can be used to configure configuration policies, enforce specific call-treatment, security, and routing policies on each SIP trunk by originating SIP entity.

In a scenario where multiple SIP hops are involved in a call, there would be multiple via headers involved, and the topmost via header of an incoming SIP invite represents the last hop that forwarded the SIP request, and the bottom-most via header would represent the originator of the SIP request. This feature supports matching by the last hop that forwarded the request (neighboring SIP entity), which is the topmost via header.


Note

For incoming dial-peer match based on URI, if there are multiple dial-peer matches, then the longest matching dial-peer is chosen (similar to multiple dial-peer match based on incoming called number). However for URI pattern match, there is no match length and hence this is the least preferred.

Configuring an Inbound Dial Peer to Match on URI

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. voice class uri voice-class-uri-tag
  4. Specify a URI field for the voice class:
    • host hostname-pattern
    • host ipv4: ipv4-address
    • host ipv6: ipv6-address
    • host dns: dns-address
    • pattern uri-pattern
    • user-id username-pattern
  5. exit
  6. dial-peer voice tag voip
  7. session protocol sipv2
  8. incoming uri { from | request | to | via} voice-class-uri-tag
  9. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device> configure terminal

Enters global configuration mode.

Step 3

voice class uri voice-class-uri-tag

Example:


Device(config)# voice class uri 200

Creates a voice class for matching SIP dial peers and enters voice URI class configuration mode.

Step 4

Specify a URI field for the voice class:

  • host hostname-pattern
  • host ipv4: ipv4-address
  • host ipv6: ipv6-address
  • host dns: dns-address
  • pattern uri-pattern
  • user-id username-pattern

Example:


Device(config-voice-uri-class)# host server1

Example:


Device(config-voice-uri-class)# host ipv4:10.0.0.0

Example:


Device(config-voice-uri-class)# host dns:xxx.yyy.com

  • You can specify up to ten instances of the host ipv4: , host ipv6: , and host dns: commands.

  • You can specify only one instance of the host hostname-pattern commands.

  • Length of uri-pattern , username-pattern , and hostname-pattern should be less than 32.

  • username-pattern is matched against the username field of the URI.

  • hostname-pattern is matched against the host field of the URI.

  • uri-pattern is matched against the entire URI.

  • Only one instance of the pattern and host commands are possible.

Note 

Patterns are case-sensitive.
Step 5

exit

Example:


Device(config-voice-uri-class)# exit

Enters global configuration mode.

Step 6

dial-peer voice tag voip

Example:


Device(config)# dial-peer voice 6000 voip

Enters dial peer voice configuration mode.

Step 7

session protocol sipv2

Example:


Device(config-dial-peer)# session protocol sipv2

Configures SIP as the session protocol type.

Step 8

incoming uri { from | request | to | via} voice-class-uri-tag

Example:


Device(config-dial-peer)# incoming uri via 200

Configures the voice class with an inbound dial peer, so that it is matches against configured URI fields.

Step 9

end

Example:


Device(config-dial-peer)# end

Exits dial peer voice configuration mode and enters privileged EXEC mode.

Examples for Configuring an Inbound Dial Peer to Match on a URI

Matching Against IPv4 Address and VIA

CUBE is configured to use incoming dial-peer 101 for incoming SIP calls from remote SIP endpoint having an IP address of 10.10.10.1 

voice class uri 201 sip
host ipv4:10.10.10.1
 
dial-peer voice 101 voip
 session protocol sipv2
 incoming uri via 201

Incoming INVITE that can be matched against this dial peer. 

INVITE sip:123@1.2.3.4:5060 SIP/2.0
Via: SIP/2.0/TCP 10.10.10.1:5093;branch=z9hG4bK-17716-1-0
Via: SIP/2.0/TCP 10.10.14.20:5093;branch=z9hG4bK-28280-1-0

Matching Against DNS Name and VIA

CUBE is configured to use incoming dial-peer 102 for incoming SIP calls from sample.com or an IP address that represents one of the resolved IP address of sample.com. 

voice class uri 202 sip
host dns:sample.com
 
dial-peer voice 101 voip
 session protocol sipv2
 incoming uri via 202

Incoming INVITE that can be matched against this dial peer. 

INVITE sip:123@1.2.3.4:5060 SIP/2.0
Via: SIP/2.0/TCP sample.com;branch=z9hG4bK-17716-1-0

INVITE sip:123@1.2.3.4:5060 SIP/2.0
Via: SIP/2.0/TCP 10.10.10.25:5093;branch=z9hG4bK-17716-1-0

10.10.10.25 is a resolved IP address of sample.com.

Matching Against Multiple Attributes and VIA

CUBE is configured to use incoming dial-peer 103 for incoming SIP calls from xxx.yyy.com, abc.def.com and IP addresses 10.10.10.10, 10.9.10.11 and 10.10.10.10. 

voice class uri 203 sip
  host dns:xxx.yyy.com
  host dns:abc.def.com
  host ipv4:10.10.10.10
  host ipv4:10.9.10.11
  host ipv4:10.10.10.10

dial-peer voice 103 voip
 session protocol sipv2
 incoming uri via 203

Incoming INVITE that can be matched against this dial peer. 

INVITE sip:123@1.2.3.4:5060 SIP/2.0
Via: SIP/2.0/TCP 10.10.10.10:5093;branch=z9hG4bK-17716-1-0
Via: SIP/2.0/TCP 10.10.14.20:5093;branch=z9hG4bK-28280-1-0

10.10.10.25 is a resolved IP address of sample.com.