ICT trunks with 5 servers in a cluster

Unanswered Question
Apr 19th, 2010

I need to setup intercluster trunks between two clusters. The first cluster has 5 UCM servers and the second has 3. Depending on Which servers are in the Device Pool depends on whether a the call goes through. Is there any good reference material for this type configuration?

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gogasca Mon, 04/19/2010 - 15:41

SRND for CallManager gives really good details

TRunks section

David Hailey Mon, 04/19/2010 - 15:59


Basically, the most important thing you'd need to know for ICT is that a non-gatekeeper controlled ICT may point to up to 3  CUCM servers in the destination cluster.  This is outlined with best practices in the SRND as follows:

Intercluster Trunk (Non-Gatekeeper Controlled)

This trunk is the simplest and is used for connecting to other  Unified CM clusters in either a multi-cluster single campus or a  distributed call processing deployment. This trunk does not use a  gatekeeper for call admission control, although it may use locations  configured in Unified CM if bandwidth control is required.

When defining this type of trunk, you may define up to three remote  Unified CM servers in the same destination cluster. The trunk will  automatically load-balance across all defined remote Unified CM servers.  In the remote cluster, it is important to configure a corresponding  intercluster trunk (non-gatekeeper controlled) that has a Unified CM  Group containing the same servers that were defined as remote Unified CM  servers in the first cluster. A similar configuration is required in  each Unified CM cluster connected by the intercluster trunks.

For example, if Cluster 1 has a trunk to Cluster 2 and Cluster 2 has a  trunk to Cluster 1, the following configurations would be needed:

Cluster 1

Servers B, C, and D are configured as  members of the Unified CM Group defined in the device pool associated  with the trunk to Cluster 2.

The non-gatekeeper controlled trunk has  Cluster 2's remote servers D, E, and F configured.

Cluster 2

Servers D, E, and F are configured as  members of the Unified CM Group defined in the device pool associated  with the trunk to Cluster 1.

The non-gatekeeper controlled trunk has  Cluster 1's remote servers B, C, and D configured.

The link to the SRND is here: http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/trunks.html


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