CCIE Voice Lab Blog

Controlling mcast MoH resources

To control multicast MoH, be sure on what is required.  Determine whether multicast MoH is required from the Callmanager MoH servers to a remote branch or instead multicast MoH from the remote branch’s flash.  This will determine what number you set the “hops” setting to under the MoH server definition under Callmanager.  For streaming locally from remote branch flash, the hop count should be set to 1.  If streaming from Callmanager in the HQ, the hop count should be set higher, such as 4.

Additionally, use separate regions/device pools to control what codec is used for the MoH if streaming from Callmanager.  If streaming locally using say G.729, ensure that the correct multicast IP address or port is specified in the local “call-manager-fallback” configuration.

Ie. If using G.729 for mcast MoH from the remote branch’s flash, the IP address would be 239.1.1.3 port 16384, or if using Port increments, 239.1.1.1 port 16386.