Ok, this is weird. I went in and deleting the MOH audio source, the MRG, MRGL, and totally recreated it. Then, made a call from the cell phone, and the hold music worked for one call. then, for some reason it quit. I did it all again, and now it's not working again..
In order to remove any doubt regarding codecs, try configuring a separate region for your MoH and assign this to a new device pool. Configure the MoH region to use G711 to the Region your gateway is situated.
Then assign the device-pool to the MoH Server and update and reset.
This will ensure that G711 is used explicity between regions. Also ensure that you have configured or allocated your MoH server(s) to your MRG and not left in the default unselected.
I also have had the same issue several times. With a multicast MOH MRGL on the subscriber I cannot send MoH to PSTN callers. The callers just hear silence. This also seems to be intermittent. I have a dot1q subinterface on the gateway connected to the voice VLAN which is where the UCM subscriber is located. The publisher is on antoher site.
Has anybody out there managed to ever get this working properly with multicast MoH for PSTN calls?
This is with version 6.1.
I have done everything suggested in other posts and it is still the same!
No idea if this is a fix or not, but I removed the check from the "Use Multicast for MOH Audio (If at least one multicast MOH resource is available)" under the MRG list and reset it. It's working though our gateway now just fine..
Also applied the ccm-manager command to our gateway:
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