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System Test Architecture Reference Manual for IP Telephony
OL-11591-01
Chapter 12 IP Video Telephony Configuration
Cisco Unified Videoconferencing 3540 MCU Conference Bridge Configuration for IP Video Telephony
Gatekeeper Call Routing
Calls are routed through the gatekeeper as follows:
• Inbound call to Cisco Unified CallManager zone from other gatekeepers—Routed to the registered
Cisco Unified CallManager Gatekeeper-controlled H.225 intercluster trunks within the Cisco
Unified CallManager zone in a Round Robin distribution algorithm using the Default Technology
prefix.
• Outbound call from Cisco Unified CallManager zone to other gatekeepers—Normal gatekeeper call
routing using location request.
• Inbound Call to MCU zone from other gatekeepers—Routed out to the registered Cisco Unified
CallManager gatekeeper-controlled H.225 intercluster trunks within the Cisco Unified CallManager
zone in a round robin distribution algorithm using the Default Technology prefix. Then routed by
Cisco Unified CallManager directly to the MCU via its H.323 gateway.
• Outbound call from MCU—Routed to Cisco Unified CallManager via the MCU dedicated H.225
gatekeeper-controlled trunks that are registered to the MCU zone.
• Outbound call from H.323 endpoints—Routed to Cisco Unified CallManager via RasAggregator
H.225 trunk.
• Inbound call from other Gatekeepers to H.323 endpoints—Call is first routed out the Registered
Cisco Unified CallManager gatekeeper-controlled H.225 trunk within the Cisco Unified
CallManager zone in a round robin distribution algorithm using the Default Technology prefix. It is
then routed back to the gatekeeper video endpoint zone via the RasAggregator trunk.
• Inbound call from MCUs to H.323 endpoints—Call is first routed to Cisco Unified CallManager via
the MCU dedicated H.225 gatekeeper-controlled trunks that are registered to the MCU zone. It is
then routed back to the Gatekeeper Video endpoint zone via the RasAggregator trunk.
• Inbound call from Cisco Unified Videoconferencing gateway—Call is routed to the registered
Cisco Unified CallManager gatekeeper. The gatekeeper receives an admission request from the
Cisco Unified Videoconferencing gateway, and the gatekeeper replies with an admission confirm to
send the call to Cisco Unified CallManager via the RasAggregator trunk.
Cisco Unified Videoconferencing 3540 MCU Conference Bridge
Configuration for IP Video Telephony
This section provides basic information about configuring the Cisco Unified Videoconferencing 3540
for IP video telephony.
For related information, refer to Administrator's Guide for Cisco Unified Videoconferencing 3511 MCU
and Cisco Unified Videoconferencing 3540 MCU Module Releases, which are available at this URL:
http://www.cisco.com/en/US/products/hw/video/ps1870/prod_maintenance_guides_list.html
The Very Large Campus Clustering over the WAN deployment model consisted of these components:
• 3544 Cisco Unified Videoconferencing chassis
• Cisco Unified Videoconferencing 3544 System 100-port MCU module
• EMP3 board