[cisco-voip] MOH Multicast

[CarlosOrtiz at bayviewfinancial.com]

So in this case I checked all audio sources and it appears that they have 
4 codecs per file - ULAW, ALAW, G.729 and WB.   I guess that's 32 streams 
if I followed what you said correctly. 

In reviewing the doc they mention MOH via two paths in case you have SRST 
and non SRST remote sites.   This could be accomplished by using same IP 
address per stream and different port numbers.  I am thinking maybe this 
could be another solution for playing 2 files to a location.  One from the 
gateway and one from the CM via Multicast MOH.

Carlos





Ryan Ratliff <rratliff at cisco.com> 
03/02/2007 10:33 AM

To
CarlosOrtiz at bayviewfinancial.com
cc
cisco-voip at puck.nether.net
Subject
Re: [cisco-voip] MOH Multicast






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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