To use Cisco remote gateways as multicast MOH resources, you must configure Cisco CallManager to multicast MOH to the desired branch sites. To accomplish this, you must configure IP addresses, ports numbers, the MOH source, and the MOH audio server.

Configuring the MOH server involves designating a maximum number of hops for the audio source. A configuration of one hop keeps Cisco CallManager multicast MOH packets from reaching the WAN.