Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 5 – Connecting Cisco VCS to a cluster of CUCM nodes
Cisco VCS Deployment Guide: CUCM v6.1, 7 and 8 with Cisco VCS X7 using a SIP trunk
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Appendix 5 – Connecting Cisco VCS to a
cluster of CUCM nodes
cluster of CUCM nodes
When connecting Cisco VCS to a cluster of CUCM nodes, Cisco VCS needs to be able to route calls
to each of these CUCM nodes.
to each of these CUCM nodes.
This can be done in 3 ways, in order of preference:
1. With a single neighbor zone in VCS with the CUCM nodes listed as location peer addresses. This
option is only available from VCS X7.0 or later.
2. By using DNS SRV records and a Cisco VCS DNS zone.
3. By setting up multiple zones – one per CUCM node, then setting up a set of prioritized search
rules to route calls to each of the zones in the preferred order (priority values different for each
search rule).
search rule).
Options 1 and 2 are recommended as they ensure that the Cisco VCS to CUCM call load is shared
across CUCM nodes. Option 3 only provides redundancy; it does not provide load balancing.
across CUCM nodes. Option 3 only provides redundancy; it does not provide load balancing.
Option 1: Using a single neighbor zone
This is only available for a Cisco VCS running version X7.0 or later.
CUCM configuration
When in a cluster, CUCM needs to accept calls routed to number@domain (instead of
number@<ip address of CUCM>) so that Cisco VCS can send the call to any CUCM node without
having to make sure that the domain portion matches the IP address of the node that the call is being
sent to.
number@<ip address of CUCM>) so that Cisco VCS can send the call to any CUCM node without
having to make sure that the domain portion matches the IP address of the node that the call is being
sent to.
1. Go to
System > Enterprise parameters
, and find the Clusterwide Domain Configuration
section.
2. Set the Organization Top Level Domain to the same domain as the video network, for example
vcs.domain.
Cisco VCS Control configuration
Cisco VCS configuration requires 1 step:
Update neighbor zone
Update neighbor zone
1. Go to
VCS configuration > Zones
.
2. Select the CUCM Neighbor zone.
3. Configure the fields as follows:
Peer 1 address
IP address of CUCM node 1, or the domain of CUCM node 1.
Peer 2 address
IP address or the domain of CUCM node 2.
Peer 3 address
IP address or the domain of CUCM node 3, or blank if no CUCM node 3.
Peer 4 address
IP address or the domain of CUCM node 3, or blank if no CUCM node 4.
Peer 5 address
IP address or the domain of CUCM node 3, or blank if no CUCM node 5.