I'm facing an issue with one of our customer. The customer has a Corporate and remote branches.In the coporate site i configure Multicast MOH and added in a MRG with enabling Multicast and put in MRGL.All ip phones and Voicemail ports in the same DP which contain the MOH Server.Now when calling from outside and put outside callers on hold they hear silence and MOH is not streaming.I tried removing the multicast checkbox on the MRG and now it's working but i lost the part of making remote branches to have MOH stream from the flash on the router it's self.
What other solution can be done so i can have Multicast for remote branches and remain MOH for the internal and outside callers?
Cisco recommends that you configure multicast MoH audio sources to use IP addresses in the range 22.214.171.124 to 126.96.36.199, which is reserved for administratively controlled applications on private networks.
So you can use
access-list 1 deny 188.8.131.52 access-list 1 permit any
Above is not tested one. You wil lhave to test is before deployment and see if it is not restricting any other traffic.
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It means your Corporate network gateway is 3 hops away from the CUCM MOH source. you can do two things
1) Switch back hop to 1 and configure you Corporate gateway to generate locle MOH file like your branch site does.
2) keep hop as 3 and apply ACL through out network to stop Multicast MOH related traffic on WAN.
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