As per CUCM SRND multicast MoH call details, looks the multicast MoH is care the IP address only which means not care the port number.
-cucm configure to 126.96.36.199 port 16384, check mark 'port incremental', g711 codec between MoH server and SRST site IP Phones
-srst configure to 239 1.1..1 port 16444 x.x.x.x x.x.x.x
call establishment between two IP Phones in SRST site and press Hold button on one of IP Phone, the Holdee will receive multicast MoH from local SRST router with IP address 188.8.131.52.
->what about the port requirement at this time? Is the Holdee receiving multicast MoH traffic from 184.108.40.206 with regardness the port or must mach the port (16384) which configured in CUCM? I don't see the port number match requirement from CUCM SRND doc and want to know the exact behavior,
The phones will be instructed by CCM to listen to a particular mcast group (i.e. IP address). Apparently they don't subscribe to a particular port, so the UC SRND recommends you increment the IP Address, not port.
On CCM, you can choose between incrementing the IP Address (i.e. source 1 = 220.127.116.11 16384, source 2 = 18.104.22.168 port 16384 etc), or the Port (source 1 = 22.214.171.124 16384, source 2 = 126.96.36.199 16392).
Note that the ports or IPs don't increment one at a time, they jump up depending on which codec you are transmitting etc.
As long as you have configured the gateway to stream to the same IP/port that the CCM will instruct the phones to listen to (i.e. if you are incrementing on IP and using source 2, then set it to 188.8.131.52 16384) then it will work.
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