RTP Media Loopback for SIP Calls

Table Of Contents

Configuring RTP Media Loopback for SIP Calls

Prerequisites for Configuring RTP Media Loopback for SIP Calls

Restrictions for Configuring RTP Media Loopback for SIP Calls

Configuration Examples for RTP Media Loopback

Configuring RTP Media Loopback for SIP Calls

RTP packets are looped back toward the source device when the RTP Media Loopback for SIP Calls feature is configured on a dial peer. The SIP RTP media loopback can be used during Cisco UBE deployments to make test calls to verify the media path between the endpoints and Cisco UBE. In a voice loopback call, an echo is heard at the device originating the call. In a video loopback call, the locally captured video and the audio echo must be rendered at the source device.

Prerequisites for Configuring RTP Media Loopback for SIP Calls

Media packets must be enabled to pass through the gateway. Use the media flow-through command in dial peer voice or voice service configuration mode to enable the media packets.

Cisco Unified Border Element

•Cisco IOS Release 15.1(4)M or a later release must be installed and running on your Cisco Unified Border Element.

Cisco Unified Border Element (Enterprise)

•Cisco IOS XE Release 3.3S or a later release must be installed and running on your Cisco ASR 1000 Series Router.

Restrictions for Configuring RTP Media Loopback for SIP Calls

•SRTP, DTLS, and STUN are not supported in loopback mode.

•Fax (midcall transmit function change) is not supported.

•RSVP is not supported.

•Call transfer is not supported.

SUMMARY STEPS

1. enable

2. configure terminal

3. dial-peer voice tag voip

4. destination-pattern string

5. session protocol sipv2

6. session target loopback:rtp

7. incoming called-number string

8. exit

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	dial-peer voice tag voip Example: Router(config)# dial-peer voice 77 voip	Specifies that the dial peer is a VoIP peer and enters dial peer voice configuration mode.
Step 4	destination-pattern string Example: Router(config-dial-peer)# destination-pattern 77	Specifies the prefix or the full E.164 number for the dial peer.
Step 5	session protocol sipv2 Example: Router(config-dial-peer)# session protocol sipv2	Specifies the session protocol for calls with the SIP option.
Step 6	session target loopback:rtp Example: Router(config-dial-peer)# session target loopback:rtp	Designates a network-specific address to receive calls from a VoIP dial peer and configures all voice data to loop back to the source.
Step 7	incoming called-number string Example: Router(config-dial-peer)# incoming called-number 77	Specifies a digit string that can be matched by an incoming call to associate the call with the dial peer.
Step 8	exit Example: Router(config-dial-peer)# exit	Exits dial peer voice configuration mode and enters global configuration mode.

Configuration Examples for RTP Media Loopback

This section provides the following examples:

•Example: Configuring Video Loopback with Cisco Telepresence System

•Example: Configuring Video Loopback with Cisco Unified Video Advantage (CUVA)

Example: Configuring Video Loopback with Cisco Telepresence System

The following sample output shows Media Loopback for SIP Calls configured on a Cisco Telepresence System (CTS).

!

codec profile 1 aacld 

 fmtp "fmtp:96 
profile-level-id=16;streamtype=5;mode=AAChbr;config=B98C00;sizeLength=13;indexLength=3;ind
exDeltaLength=3;constantDura

tion=480"

!

codec profile 2 h264

 fmtp "fmtp:112 profile-level-id=4D0028;sprop-parametersets=

R00AKAmWUgDwBDyA,SGE7jyA=;packetization-mode=1"

!

voice class codec 4

 codec preference 1 aacld profile 1

 video codec h264 profile 2

!

dial-peer voice 2000 voip

 destination-pattern 2000

 rtp payload-type cisco-codec-fax-ind 110

 rtp payload-type cisco-codec-aacld 96

 rtp payload-type cisco-codec-video-h264 112

 session protocol sipv2

 session target loopback:rtp

 incoming called-number 2000

 voice-class codec 4

 voice-class sip bandwidth audio tias-modifier 64000

 voice-class sip bandwidth video tias-modifier 4500000

!

Example: Configuring Video Loopback with Cisco Unified Video Advantage (CUVA)

The following sample output shows Media Loopback for SIP Calls configured on a Cisco Unified Video Advantage (CUVA).

!

codec profile 3 h264

 fmtp "fmtp:98 profile-level-id=420015"

 !

voice class codec 6

 codec preference 1 g711ulaw

 video codec h264 profile 3

 !

dial-peer voice 5000 voip

 description CUVA

 destination-pattern 5000

 rtp payload-type cisco-codec-video-h264 98

 session protocol sipv2

 session target loopback:rtp

 incoming called-number 5000

 voice-class codec 6

 voice-class sip bandwidth video tias-modifier 384000