MOH works between IP phones but not between an IP phone and a PSTN phone. When put on hold holdee gets silence.
Loopback interface on the two MGCP Voice Gateways are not configured, but we have been adviced to put a loopback interface with a routable IP address on it to fix this problem. These routers each has a BVI40 interface which is in the same VLAN 40 as the CCM and we can confirm that the Multicast MOH stream is hitting the Voice Gateway.
These two Voice Gateways connect to CAT 6500 interfaces which are in VLAN40 same as the CCM.
To answer your question - The two MGCP Voice Gateways (R1 and R2) are Cisco 3845 with Gi0/0 and Gi0/1 in bridge-group 40 with BVI40 interface having the IP address. Configuration similar on R1 and R2 . Then R1's Gi0/0 and R2's Gi0/0 connect to one CORE1 (CAT 6500) and R1's Gi0/1 and R2's Gi0/1 is connected to CORE2 (CAT 6500). This is how the routers are setup. I am unable to answer your question on why they did it this way rather than have Gi0/0 and Gi0/1 in different IP subnets and run OSPF or simpler still just run HSRP. if redundancy is what they are trying to achieve and to achieve they say they are using BVI interface.
Please explain on what circumstance ccm-manager music-on-hold bind interface is required. In our case it was required. But you said that the bind interface is not always required. So when is it required and when is it not required. May be it is not required if a loopback interface was also defined on the router.
We had to use the mgcp bind command to fix a similar issue, except it was no moh over an ICT. Otherwise your gateway registers with the external serial IP rather than something from your internal subnet. Once we did that and made sure all the media resources were in place, MTP, transcoding etc we were good to go. Try the config below, which is what we have.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...