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System Test Architecture Reference Manual for IP Telephony
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Chapter 12 IP Video Telephony Configuration
Cisco Unified CallManager Configuration for IP Video Telephony
Region A – SJC Cisco Unified CallManager – Region B – Transcoder – Region C – Intercluster trunk –
Region D – transcoder – Region E – DFW Cisco Unified CallManager – Region F
The regions include the following devices:
• Region A (SJC-Video)—All video enabled phones, including Cisco Unified Video Advantage
• Region B (SJC-Local)—All devices without video capabilities
• Region C (SJC-WAN)—All intercluster trunks
• Region D (DFW-WAN)—All intercluster trunks
• Region E (DFW-Local)—All devices without video capabilities
• Region F (DFW-Video)—All video enabled phones, including Cisco Unified Video Advantage
Table 12-24 shows the regions matrix for SJC.
Table 12-25 shows the regions matrix for DFW.
If the H.323 video endpoint in SJC called directly to an H.323 video endpoint in DFW, a transcoder
would not be invoked and video would be available for the call. However, in this scenario, a transcoder
is invoked before the call is transferred. Therefore, video is not available after the call transferred.
Note This transfer scenario applies to all calls transferred via Cisco Unity Automated Attendant and via
Cisco IPCC Express.
Video Deployment with RSVP
You can use Cisco RSVP Agent to control video bandwidth. Such a deployment could be use in a
situation where an audio device can use only G.711 and audio transcoding is necessary.
Cisco RSVP Agent is an IOS-based RSVP proxy with an SCCP interface and is the only method for
performing audio transforming of a video call. Cisco RSVP Agent registers to Cisco Unified
CallManager through SCCP as an MTP or transcoder. Video endpoints do not need to support RSVP, but
they do need to be allocated a media resource group that contains a Cisco RSVP agent. When RSVP or
audio transcoding is required, Cisco Unified CallManager inserts a Cisco RSVP Agent in the call to
perform RSVP reservation or transcoding.
Table 12-24 SJC Regions Matrix
Region A Region B Region C
Region A G.711/384 G.711/384 G.711/384
Region B G.711/384 G.711/384 G.729/384
Region C G.711/384 G.729/384 G.729/384
Table 12-25 DFW Regions Matrix
Region D Region E Region F
Region D G.729/384 G.729/384 G.711/384
Region E G.729/384 G.711/384 G.711/384
Region F G.711/384 G.711/384 G.711/384
