Scott,
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
Hailey
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