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New Member

multicast routing for MOH

I want to use multicast routing for Music on Hold. I am running h323 on my voice gateways.

I have one centralized call manager and several remote sites with IP Phones.

Does anyone have any good router configs for setting up multicast routing??

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Cisco Employee

Re: multicast routing for MOH

The main thing you need to do on each router is enable ip multicast-routing and in addition, on each router interface through which the MoH packets may travel, you should enable one of:

ip pim sparse-mode

ip pim sparse-dense-mode

ip pim dense-mode

A good document for reading about this is:

Additionally, if you have any follow-up questions that this does not answer or if you have any trouble setting it up, please contact the Cisco TAC and open a case regarding IP Multicast routing.

New Member

Re: multicast routing for MOH


I have validated Multicast MOH with an MGCP gateway (I think it does not work with H.323). Once you have enabled multicast in CCM config (audio source, moh server and MRG), you just have to configure 'ccm-manager music-on-hold' in the gateway so that it receives the multicast address when a PSTN user is put on hold.

Here is an excerpt from the gateway config (mostly done by CCM) :

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server

ccm-manager config


controller E1 1/0

framing NO-CRC4

pri-group timeslots 1-31 service mgcp


interface Serial1/0:15

no ip address

no logging event link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn sending-complete

no cdp enable


voice-port 1/0:15

cptone FR



mgcp call-agent P-MCS-P 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp package-capability rtp-package

mgcp package-capability sst-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static


mgcp profile default


dial-peer voice 9991015 pots

application mgcpapp

port 1/0:15