Branch Router is able Multicast MOH with PSTN phones but not working between IP Phones. I am enclosing the config below which I have at the brach location.
int vlan 300
description voice vlan
ip pim dense-mode
ip source-address 192.168.10.1 port 2000
max-dn 40 dual-line
multicast moh 184.108.40.206 port 16384 Loopbak IP and then VLAN IP