[cisco-voip] MOH from Router Flash between internal callers

[Ryan Ratliff]

I don't recall this ever not being supported, in fact the whole point of using the router flash for MOH was to get it working to phones and PSTN gateways at the remote site.

It is most definitely supported and there are quite a few people that use it with no issues.  The reason you were asked for traces is because if the configuration looks good, then the traces are the best way to confirm what MOH audio source/server CUCM is selecting and why the multicast address the phone is told to listen to doesn't line up with what the router is sending.

You are correct and it is fairly straight forward.  One slight correction is that it is not the phone initiating the hold but rather the CUCM server that instructs the held party to listen to the MOH stream.   The address used will be a combination of the user hold audio source  configured on the holding phone and the MRGL of the held phone.

You can also find out the address the phone is being told to listen to by putting the phone on hold, and then pointing a web browser at the held phone's IP address.  Click on the Streaming Statistics links until you see the multicast address.  If everything is configured correctly then this address and port will match that configured on the SRST router.  If it doesn't match, then your CUCM configuration is not correct.  If it does match and the phone is still hearing silence on hold then you need to troubleshoot the layer 2 and 3 multicast between the SRST router and the IP phone.

-Ryan

On Dec 8, 2009, at 4:22 PM, steve.siltman at assurant.com wrote:


Has anyone been able to get this too work?  I turned on Multicast within the internal network at this remote site and I'm unable to get the phones to hear the MOH between two internal Cisco IP Phones.  Years ago, I read that this wasn't possible but was hoping this was resolved in later versions.  We are running v7 Call Manager with 12.4.24 router code.  MOH works fine to external customers.  It seems fairly straight forward as the one Cisco IP phone issues the Hold and sends the multicast ip address to the other phone.  I'm not sure why the other phone doesn't pick up on the stream.  Grr 

If this isn't supported then I'll have to allow MOH across the WAN and forget about using the routers flash outside of SRST. 

I've got a ticket open with Cisco and they verified the configuration and have asked for trace files.  Either this TAC person doesn't know it isn't supported or something has changed since my Cisco Voice Gateways book was printed in 2006. 

Thanks, 

-Steve 
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