Configuring Cellophane Codec Pass-Through and Media Flow-
Around
Figure 9-17 shows a sample book acclimated to configure H.323-to-H.323 interworking,
including cellophane codec pass-through and media flow-around, application a Cisco UBE
router. The Cisco Unified Communications Manager array in San Jose is affiliated with
the Cisco Unified Communications Manager Express router in Chicago application a Cisco
UBE router. Codec agreement is performed anon amid the Cisco Unified
Communications Manager array and the Cisco Unified Communications Manager
Express router, and RTP streams breeze anon amid the endpoints.
Chapter 9: Establishing a Connection with an Internet Telephony Service Provider 543
IP IP IP IP
IP WAN
H.323
R1
Cisco UBE
Phone1-1
2001
Phone1-2
2002
Phone3-1
3001
Phone3-2
3002
San Jose
Chicago
H.323
Cisco Unified
Communications Manager
Express: 192.168.2.254
Cisco Unified Communications
Manager Cluster: 192.168.1.1
Direct Codec Negotiation
Between San Jose and
Chicago
Direct RTP Stream
Between San Jose and
Chicago
V
Figure 9-17 Cellophane Codec Pass-Through and Media Flow-Around Example
Topology
Codec accuracy enables a Cisco UBE router to canyon codec capabilities amid endpoints.
If you configure transparency, a Cisco UBE router uses the codec that was specified
by the endpoints for ambience up a call. To accredit endpoint-to-endpoint codec negotiation
without a Cisco UBE router, use the codec cellophane command.
With the absence configuration, a Cisco UBE router receives media packets from the
inbound alarm leg, terminates them, and again reoriginates the media beck on an outbound
call leg. Media flow-around enables media packets to be anesthetized anon between
the endpoints, after the action of a Cisco UBE router. The Cisco UBE router
continues to handle acquisition and announcement functions. Media flow-around for SIP-to-SIP calls
is not supported. Use the media flow-around command to accredit media flow-around.
Example 9-6 illustrates the use of both the codec cellophane and the media flowaround
commands.
Example 9-6 Cellophane Codec Pass-Through and Media Flow-Around Configuration
544 Authorized Self-Study Guide: Cisco Articulation over IP (CVOICE)
R1(config)#dial-peer articulation 2000 voip
R1(config-dial-peer)#description To Cisco Unified Communications Manager
R1(config-dial-peer)#destination-pattern 2...
R1(config-dial-peer)#session ambition ipv4:192.168.1.1
R1(config-dial-peer)#dtmf-relay h245-alphanumeric
R1(config-dial-peer)#codec transparent
R1(config-dial-peer)#media flow-around
R1(config-dial-peer)#exit
R1(config)#dial-peer articulation 9011 voip
R1(config-dial-peer)#description To Cisco Unified Communications Manager Express
R1(config-dial-peer)#destination-pattern 3...
R1(config-dial-peer)#session ambition ipv4:192.168.2.254
R1(config-dial-peer)#codec transparent
R1(config-dial-peer)#media flow-around