[sip profile] SIP Profile로 SDP까지 변경 가능

참고자료

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-border-element/118825-technote-sip-00.html

https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/105624-cube-sip-normalization.html

Cisco에서 SIP 메시지를 변경할 수 있는 방법은 2가지 

1. VG에서 SIP profile을 이용하여 변경 

2. CUCM에서 Normalize Script를 이용하여 SIP 변경 

이때 VG에서는 SIP Header만 변경할 수 있다고 생각했지만 해당 문서를 확인해 본 결과 

SDP Header도 변경 가능하다. 

SDP 변경 CLI 

rtr(config-class)#response 200 sdp-header ?
  Attribute				a=
  Audio-Attribute			a=
  Audio-Bandwidth-Info		b=
  Audio-Connection-Info		c=
  Audio-Encryption-Key		k=
  Audio-Media				m=audio
  Audio-Session-Info			i=
  Bandwidth-Key			b=
  Connection-Info			c=
  Email-Address			e=
  Encrypt-Key				k=
  Phone-Number				p=
  Repeat-Times				r=
  Session-Info				i=
  Session-Name				s=
  Session-Owner			o=
  Time-Adjust-Key			z=
  Time-Header				t=
  Url-Descriptor			u=
  Version				v=
  Video-Attribute			a=
  Video-Bandwidth-Info		b=
  Video-Connection-Info		c=
  Video-Encryption-Key		k=
  Video-Media				m=video
  Video-Session-Info			i=

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Contents

Introduction

Prerequisites

Requirements

Components Used

Common SIP Message Normalization Scenarios

Copy Value from "Diversion" Header to the "From" Header

Copy Number from "To" header in an Incoming Invite to the "REQ-URI" Parameter (Prior to Cisco IOS Vesion 15.4)

Copy Number from "To" Header in an Incoming Invite to the "REQ-URI" Parameter (with Inbound SIP Profiles)

One-way / No-way Audio Interoperability Issues with Provider

Remove the "UPDATE" Method Support to Avoid Interoperability Issues

IP Address to Domain Name Conversion

Add a Prefix in the "Diversion" Header

Possible Issues

Introduction

This document describes how to use the Session Initiation Protocol (SIP) Profile Test Tool that is available for use on Cisco.com. SIP Profiles are used in order to manipulate header information in the SIP messages. They can also be used to make changes in the Session Description Protocol (SDP), which is used to negotiate media.

Prerequisites

Requirements

The information in this document is based on Cisco Integrated Service Router (ISR) Generation 1 (2800/3800) or Generation 2 (2900/3900) series.

Components Used

Cisco recommends that you have knowledge of these topics:

• Navigation through Cisco IOS^®
• SIP message format and transactions

Common SIP Message Normalization Scenarios

This section provides several SIP message normalization scenarios that have been seen frequently. Each scenario includes the configuration required on Cisco IOS for you reference and a screenshot from the SIP Profile Test Tool that is mentioned in the Introduction.

These scenarios can be used as references for other manipulation required on the SIP messages.

Copy Value from "Diversion" Header to the "From" Header

voice class sip-profiles 1

request INVITE sip-header Diversion copy "<sip:(.*)@.*" u01

request INVITE sip-header From copy ".*<sip:(.*)@.*" u02

request INVITE sip-header From modify "(.*)<sip:.*@(.*)" "\1<sip:\u01@\2"

request INVITE sip-header From modify "<sip:@" "<sip:\u02@"

Copy Number from "To" header in an Incoming Invite to the "REQ-URI" Parameter (Prior to Cisco IOS Vesion 15.4)

Copy the number in the To header in an inbound Invite message and modify the outgoing INVITE:

voice class sip-copylist 1
sip-header TO

voice class sip-profiles 2
request INVITE peer-header sip TO copy "sip:(.*)@" u01
request INVITE sip-header SIP-Req-URI modify ".*@(.*)" "INVITE sip:\u01@\1"

Copy Number from "To" Header in an Incoming Invite to the "REQ-URI" Parameter (with Inbound SIP Profiles)

voice class sip-profiles 1
 request INVITE sip-header TO copy "sip:(.*)@" u01
 request INVITE sip-header SIP-Req-URI modify ".*@(.*)" "INVITE sip:\u01@\1"

voice service voip 
sip 
sip-profiles inbound 
sip-profiles 1 inbound

One-way / No-way Audio Interoperability Issues with Provider

voice class sip-profiles 200
request ANY sdp-header Audio-Attribute modify "a=inactive" "a=sendrecv"
request ANY sdp-header Audio-Connection-Info modify "0.0.0.0" "CUBE’s IP" 

Remove the "UPDATE" Method Support to Avoid Interoperability Issues

voice class sip-profiles 200
 request ANY sip-header Allow-Header modify ",UPDATE" ""

IP Address to Domain Name Conversion

voice class sip-profiles 1
 request ANY sip-header SIP-Req-URI modify "10.67.138.241:5060" "sipp.cisco.com"

Add a Prefix in the "Diversion" Header

voice class sip-profiles 1
 request ANY sip-header Diversion modify "sip:(.*)@" "sip:704264\1@"

Possible Issues

Here are some possible issues you might encounter.

• After Cisco IOS Version 15.4, the SIP profile feature is introduced to modify inbound SIP messages as well.
• Cisco IOS Versions 15.3 and earlier only support SIP profiles in the outbound direction.