11-09-2005 09:30 PM - edited 03-13-2019 11:10 AM
Are there any special configuration options for a H.323 gateway to get multicast MOH functional?
MOH works fine, but when I configure the MOH server for multicast and assign it to the appropriate MRG and MRL I get silence when the user is put on hold.
I read somewhere that a loopback interface needs to be created on the gateway, is this true for all cases?
Thanks
Solved! Go to Solution.
01-24-2006 02:08 PM
I had the same issue.
Verify the multicast routing.
I came across this bug, which will help you out.
CSCeb58213
MOH doesnot stream if MTP unchecked for H.323 Gateway
Check the MTP required in your H.323 gateway configuration. And reset the gateway.
11-09-2005 11:41 PM
Hi
Are you trying to get the gateway to transmit or receive mcast MoH?
Do you mean receive and that users on the PSTN can't hear the sound?
If you mean that I think you need the 'ccm-manager music-on-hold' command on the gateway.
Aaron
11-10-2005 02:17 AM
Hi,
Is your infrastructure multicast enabled?
You could add the following commands to your router:
(global config)
ip multicast-routing
and on your interfaces:
ip pim sparse-dense-mode
ip igmp join-group x.x.x.x ====>>>ip address of multicast source
ccm-manager music-on-hold is for mgcp gateways to the best of my knowledge....
HTH
Andy
11-10-2005 07:56 AM
Thank you for the replies.
Callers from the PSTN do not receive any MOH, they just get silence. It doesn't matter if the call originates inside or outside.
Not looking to stream MOH to seperate sites, just main office. The only reason multicast is being configured is so the music constantly "loops" without starting from the beginning.
Yes ccm-manager commands are for MGCP gateways.
I will try the ip multicast-routing suggestion and let you know.
Thanks for the help
11-10-2005 12:13 PM
Sorry - didn't read your post properly...
I'll try harder - what version of IOS do you have? According to the SRND 4.1 you need 12.2(8)T to receive mcast MOH on H323.
Aaron
11-10-2005 02:31 PM
Don't forget to check the hop count on the audio source in the MoH server config, that one has gotten me before. Especially since they have total silence, that means the server thinks he is playing it, or else you would get tone on hold.
Mary Beth
11-10-2005 03:25 PM
But, it is more likely to be your router needing to be configured for multicast, if it was not (from the rls notes when mcast moh on gateway first supported)-
The default router in the network for handling multicast traffic must have the following enabled:
Multicast routing
A multicast routing protocol, for example Protocol Independent Multicast (PIM) or Distance Vector Multicast Routing Protocol (DVMRP)
An IP routing protocol, for example Routing Information Protocol (RIP) or Open Shortest Path First (OSPF)
When you configure a multicast address on a gateway, the gateway sends an Internet Gateway Management Protocol (IGMP) "join" message to the default router, indicating to the default router that the gateway is to receive RTP multicast packets.
You might also need this multicast troubleshooting tech note, if things don't go right away:
http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080093f21.shtml
Mary Beth
12-21-2005 05:32 PM
Thanks for the help everyone!
I added in those lines into the router, still not working on calls from the PSTN.
When I do internal to internal everything works great. When a call to the outside is inbound/outbound I don't even get a beep, just silence.
Any other ip configurations you could recommend or command to troubleshoot it furhter? The link above showed some troubleshooting commands but the responses look just like the response on my router.
Thanks!
12-27-2005 06:00 PM
Was just looking around having the exact same problem, although I have an MGCP gateway.
I added the following commands to my router to get it to work.
config t
ip multicast-routing
int f0/1 (GATEWAY for MY VOICE TRAFFIC)
ip pim sparse-dense-mode
Made a call and put myself on hold and it worked. Hope this helps.
01-24-2006 02:08 PM
I had the same issue.
Verify the multicast routing.
I came across this bug, which will help you out.
CSCeb58213
MOH doesnot stream if MTP unchecked for H.323 Gateway
Check the MTP required in your H.323 gateway configuration. And reset the gateway.
02-13-2006 04:46 PM
Thank you very much... this simple setting fixed the problem!
03-07-2006 05:46 AM
I will be very careful to enable MTP on a H.323 gateway. I would rather to test the loopback option under SRST configs. I had issue before with H.323 with MTP enabled. Depends on your hardware DSP resources, it might degrade the voice quality.
01-25-2006 07:03 AM
Hello,
You MUST have a loopback interface to make Multicast MOH for PSTN callers working.
In your SRST config :
multicast moh 239.x.x.x port 16384 route
Bye
jp
03-09-2006 03:56 PM
Hi, You'll definitely need a Loopback address and the 'h323-gateway voip bind srcaddr' configured under the loopback interface.
The 'ccm-manager music-on-hold' command will also be required.
If you use the 'show ccm-manager music-on-hold' command it should show the RTP port number being received.
IF you're incrementing MOH streams by port number the port number changes based on stream number and codec used.
Cheers
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