[cisco-voip] EMCC vs Cluster SIP trunk with call forwarding

[george.hendrix at caci.com]

Guys,

  We currently have two separate CUCM clusters (9.1 and 10.5).  The 10.5 cluster would be the home cluster and the 9.1 cluster would be the remote/visiting cluster.  Which of the two would be the better option to go with?


1.      Phone is setup on 9.1 cluster and a SIP trunk between the two clusters.  Call forwarding for busy, etc. is passed over the SIP trunk to the voicemail pilot on the 10.5 cluster.

2.      Use EMCC between the clusters where the 10.5 cluster would be the home cluster.

Also, when using EMCC, the phone is actually registered with the 9.1 cluster, but the user login is with the 10.5 cluster (the extension).  Would the actual call (RTP to other phones and PSTN) access be controlled by the home cluster?  Wouldn't the phone subnet also need to be able to reach the home cluster PSTN gateways and phones?  Basically, anything it may need RTP access to?

Thanks,


Bill Hendrix | Network/VoIP Engineer
Ph. 813.281.3109
george.hendrix at caci.com<mailto:george.hendrix at caci.com>
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