Music on Hold for Internal Callers
In CME, by default when 2 x on-net callers dial one another and one party initiates a hold, the party holding will not receive music on hold. This can be resolved by using Multicast Music on Hold. When using Multicast MoH, the CME router will transmit the audio stream on the physical IP interfaces of the specified router. Under the multicast command (in telephony-service), if the SCCP bound address under telephony-service is not the physical interface (for example, if a loopback is used), the outbound interface towards the IP phones must be specified. If they are not on the next directed subnet, multicast routing must be enabled and PIM dense or sparse mode.
telephony-services
moh music-on-hold.au
multicast moh 239.1.1.10 port 16384 route 192.168.1.1
And, if the IP phones are not on the directly connected subnet:
ip multicast-routing
!
interface FastEthernet 0/0
ip pim sparse-dense-mode
