Recently upgraded to 6.1 and now our MOH through the PSTN. Internal calls IP to IP phone work fine for MOH. But through the CMM, multicast stream will not start up. We see it connecting to the stream 188.8.131.52, etc, but nothing is coming out but dead air.
Looks like the DMA tool changed the amount of Hops in the multicast. In our 4.2 config, we had defined 5 hops. After the DMA, it changed it to the default 2 hops. That screwed up multicast to/from the PSTN.