When I receive a call and place it on hold, the calling party receives MOH as specified in <X-PRE-PROCESS cmd="set" data="hold_music=/usr/local/freeswitch/sounds/music/8000/moh.WAV"/>.   Also, I  transfer this call to another extension, the caller receives MOH during the transfer, however, If I place an outbound call then place the party on hold, they just get silence.  Am I missing a basic setting here.  I also cannot transfer this call or park it.   Using snom 3xx, 7xx and 8xx phones.