After further testing I have confirmed that is indeed the IOS version that is not allowing for the Multicast MOH over a SIP trunk to a PSTN Termination.
Tested versions: c2801-adventerprisek9_ivs-mz.124-20.T4.bin = PSTN MOH DOESN"T WORK c2801-adventerprisek9_ivs-mz.124-22.T.bin = PSTN MOH WORKS Typology SIP/SKINNYPHONE -> UCM (Multicast-PUB/MGRL) -> SIPTRUNK -> (HQ-2801 sourced Multicast MOH) > PRI -> (PSTN-2821) ->PSTNPHONE If any one know anything to the contrary to my findings please respond as I am under the assumption that this is the final outcome. Thank you
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