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Music on Hold - Cisco Unified - Cisco Certified Expert
https://www.ccexpert.us/cisco-unified/music-on-hold.html#:~:text=Multicast%20MoH%20conserves%20system%20resources%20and%20bandwidth%20because,and%20server%20processor%20utilization%20would%20be%20greatly%20reduced.
Music on Hold - Cisco Unified - Cisco Certified Expert
https://www.ccexpert.us/cisco-unified/music-on-hold.html
All MoH audio sources that have been configured to allow multicasting are listed in the Selected Multicast Audio Sources section of the MoH Server Configuration window. Each audio source can have a different Max Hops …
Understanding MOH configuration - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/understanding-moh-configuration/td-p/1794122
Media Resources, the MOH server Audio Source has two items. Stream 1 and Stream 26. Both of these are configured the same way, with the same audio source file, Play Continuously and Allow Multicasting checked. Fixed MOH Audio Source Configuration. One entry is enabled, but Allow Multicasting is not checked. MOH server
Multicasting MoH - Cisco Community
https://community.cisco.com/t5/unified-communications/multicasting-moh/td-p/1280126
Basically, this setup tricks the phone into receiving its MOH from the local router. If you set the max hops to 1 for your audio source, the multicast stream will not be able to traverse the WAN. When the remote phones are told to receive a multicast stream from CUCM, they listen to the IP address/port number configured in CUCM.
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