[cisco-voip] MOH Multicast

[Ryan Ratliff]

Remember that when you configure a multicast MOH audio source you get  
one RTP stream per codec enabled.  So if you have enabled g729, etc  
MOH this can quickly lead to a lot of multicast traffic when you've  
got multiple audio sources enabled for multicast.

The reason you can only have one source for SRST MMOH is because the  
router can only play the audio on one multicast IP address/port.  In  
order for the phone to receive it CM has to tell the phone to listen  
for that particular source.

I haven't played with SRST MMOH in a while so I don't know if the  
router can play two sources or not.   The way you describe would  
certainly work but if you happen to have another router at the remote  
site you could just as easily configure it to source the other MMOH  
stream.

-Ryan

On Mar 2, 2007, at 10:26 AM, CarlosOrtiz at bayviewfinancial.com wrote:


I am trying to cleanup an inherited MOH Multicast Configuration.

They have 2 out 3 servers enabled for Multicast.  (MOH Server config  
page) They also have entered hop counts for 8 different audio sources  
for BOTH servers.

The Cisco documentaion states:

"For Cisco SRST multicast MOH, only one audio source can be used,  
even if, for example, one out of 500 sites uses Cisco SRST multicast  
MOH."
Another section of the doc states "An audio source is selected by  
inputting the audio source's maximum number of hops."

I interpret this to mean that on the MOH Servers configuration screen  
that there should only be one multicast audio source with a hop count  
entered.   I also interpret this to mean that there is no reason to  
have 8 audio sources configured for multicast when the server can  
only be used with one source.

Can anyone confirm what I have stated above?


On a related note:  Is there anyway to have a remote office play 2  
different MOH files for different sets of phones?  Our WAN does not  
support multicast at this time so I am thinking SRST local streaming  
for the biggest group of users at the remote site and unicast from  
Call Mgr for the other users.

Anyone who has done a lot of work with this stuff please comment.

Thanks,

Carlos
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