I encountered this issue with a CUBE running 15.1(4)M2. Unicast MoH was not playing, just dead air. When a call was placed on hold, a 'sh call active voice brief' indicated that the connected enpoint was "0.0.0.0", and packet counter was not incrementing. Per the bug "CSCtl21854", there are 2 workarounds, a) disable CEF on the gateway, or b) enable Duplex streaming on CUCM.
I probably could have gotten away with disabling CEF, but I didn't feel too great about it. So I went with option B, and that seems to have resolved the issue. There do not appear to be any ill effects from this, but if anyone knows of any caveats, I'd appreciate hearing them.
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