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Distributed Multisite Deployments

Posted by Andy on April 22, 2009

Unlike with centralized multisite deployments, in situations where G.711 might be required for MoH audio streams traveling across a WAN, MoH audio streams cannot be forced to G.711 in a distributed multisite deployment. Even when MoH servers are placed in a separate Unified CM region and the G.711 codec is configured between this region and the intercluster or SIP trunk’s region, the codec of the original voice call is maintained when a call between the two clusters is placed on hold by either phone. Because these intercluster calls are typically encoded using G.729 for bandwidth savings, a MoH stream from either cluster will also be encoded using G.729.

Furthermore, multicast MoH is not supported for calls between Unified CM clusters (intercluster calls). Therefore, you must configure at least one unicast MoH resource in each Unified CM cluster if you want MoH on the intercluster or SIP trunk.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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