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12-19
System Test Architecture Reference Manual for IP Telephony
OL-11591-01
Chapter 12 IP Video Telephony Configuration
Cisco Unified CallManager Configuration for IP Video Telephony
SIP Trunk Calls with Asymmetric Regions
This section provides an overview of two asymmetric regions scenarios for intercluster calls across SIP
trunks.
Scenario 1—Device with an associated Cisco Unified Video Advantage in Region A calls a device in Region D
through an intercluster trunk
In this scenario, a call proceeds as follows:
Region A – SJC Cisco Unified CallManager – Region B – SIP trunk – Region C – DFW
Cisco Unified CallManager – Region D
The regions include the following devices:
• Region A (Video)—All video enabled phones, including Cisco Unified Video Advantage
• Region B (SJC-WAN)—All intercluster trunks
• Region C (DFW-WAN)—All intercluster trunks
• Region D (SJC-Local)—All devices without video capabilities
Table 12-20 shows the regions matrix for SJC.
Table 12-21 shows the regions matrix for DFW.
When a device with an associated Cisco Unified Video Advantage in Region A calls through an
intercluster trunk in Region B, G.729 and G.711 codecs are sent from SJC to DFW during the
capabilities exchange process.
The call will arrive at DFW through an intercluster trunk in Region C and will then be routed to a device
in Region D. Only the G.729 codec will be sent from DFW to SJC during the capabilities exchange
process.
After the capabilities exchange process completes, the call will connect using the G.729 codec.
Scenario 2—H.323 video endpoint with only G.711 capabilities in Region A calls a device in Region E through an
SIP trunk
In this scenario, a call proceeds as follows:
Region A – SJC Cisco Unified CallManager – Region B – Transcoder – Region C – Intercluster trunk –
Region D – DFW Cisco Unified CallManager – Region E
Table 12-20 SJC Regions Matrix
Region A Region B
Region A G.711/384 G.711/384
Region B G.711/384 G.729/384
Table 12-21 DFW Regions Matrix
Region C Region D
Region C G.729/384 G.729/384
Region D G.729/384 G.711/384