Multicast moh from flash

Unanswered Question
Jul 10th, 2008

I'm testing multicast moh from flash and I have it working when I call in from the PSTN. I'm having trouble if I call IP phone to IP phone and place the call on hold, just dead air. Just to be clear, I'm placing a call between 2 phones connected to the etherswitch module on the remote router.

I have CCM 4.1.3 and a remote branch router that has SRST configured. G729 across the wan. MOH server in CM is set to multicast, (increment by IP address), and hops set to 1. MRGL's have been assigned to all the necessary device pools.

I've been through this doc and still can't get it to work.

Here's my config on the remote branch router:


max-conferences 8 gain -6

ip source-address port 2000

max-ephones 5

max-dn 6 dual-line preference 2

transfer-pattern .T

call-forward pattern .T


multicast moh port 16384

interface Vlan103

ip address

ip helper-address

ip pim sparse-dense-mode

interface Loopback0

ip address

ip pim sparse-dense-mode

IP multicast routing is turned on.

Output of show ephone sum:

Max Conferences 8 with 0 active (8 allowed)

Skinny Music On Hold Status

Active MOH clients 0 (max 96), Media Clients 0

File type AU Media_Payload_G711Ulaw64k 160 bytes

Moh multicast on port 16384 via

I have this problem too.
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gogasca Thu, 07/10/2008 - 09:40

MOH multicast is only G.711

IP Phone -- MOH Server with multicast should be G.711

jake-savage Mon, 07/14/2008 - 09:15

If the multicast stream passes through a g729 region, doesn't it get converted to (if you're using IP address increment?)

I did get this working by adding in multicast moh route

Jaime Valencia Mon, 07/14/2008 - 09:22

that would be if the CUCM is the MOH multicast source and you selected other codecs, the router can only stream G711



if this helps, please rate

jake-savage Mon, 07/14/2008 - 18:43

Right on, that makes sense. I have g711 and g729 selected on under the service parameters. When I have a call on hold and I type in show ccm-manager music, it shows MOH streaming using g711.


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