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Multicast MoH does not work for PSTN callers in Cisco CallManager 4.x
Multicast Music on Hold (MoH) does not work for Public Switched Telephone Network (PSTN) callers. IP phone-to-IP phone multicast MoH works fine.The most likely reason for this issue is that the gateway is not configured for multicast.
: Issue this commands on the gateway under the global configuration mode in order to resolve this problem:
Note: These commands not only enable multicast routing, but also allow the router to decode the packets so that it can send the audio out.
Some other things to check:
Verify that the gateway is in a device pool that has multicast MoH enabled. In other words, the device pool is configured with the correct Media Resource Group or Media Resource Group List.
Verify that all devices use the same codec.
Verify what codec the call comes from and the PSTN uses when it connects to the IP phone. If the PSTN calls come in with a codec other than G711, MoH must be configured to support all of the other codecs. In order to choose the codecs, complete these steps:
Open the Cisco CallManager admin page.
Choose CCMAdminpage > Service > Service Parameters > (Choose Publisher) > Cisco Ip VoiceMedia Streaming Application.
Scroll to the bottom and highlight all of the available codecs.
Note: Cisco CallManager 4.2(x) uses common profiles in order to control the Music on Hold for a large group of users. Create a new common profile and use the Bulk Administration Tool (BAT) in order to assign this profile to all of their IP phones. Refer to Common Profile Configuration for more information.