[cisco-voip] Multicast SRST, branch router, no moh for PSTN caller

[Robert Kulagowski]

Ryan Ratliff wrote:
> I'm pretty sure CM will increment the port/IP address of the MOH  
> stream going from ulaw to alaw.   Since you can only stream to one  
> multicast IP address/port from the router you need to make sure every  
> endpoint that needs to listen to that MOH source is using the same  
> codec.

I know for a fact that it does; I just ran into this issue in Sydney, 
where I put a alaw file on the router and discovered that my MOH didn't 
work.  When I looked at sh ccm-manager music-on-hold I realized that it 
was coming from 239.1.1.2 port 16384 instead of 239.1.1.1 and had to 
update my config.

However, this configuration is brittle in that 1)  I can't put 239.1.1.2 
on more than one MOH source on CM because CM then complains that the IP 
is already in use and/or 2)  I don't think that I can wildcard the IP 
address (but keep a fixed port on the router multicast moh config), so 
if a CM goes bye-bye and the phones register to another CM this is going 
to fail, correct?