Spinning my wheels on this one

[Chidado]

Scenario: Using only one Gateway SIP Provider, 2 inbound DID's, only 1 incoming DID plays music on the valet parking.
Both get parked properly in the *5901-*5903 etc. Only 1 DID will play the Music On Hold. The other one does not.

My mind keeps bringing me to NAT, but why would it work with one and not the other? They are in the same domain. Same music file.

Spinning wheels on this one.

Thank in advance if you have any suggestions.

 

[bcmike]

Maybe RTP port range? Maybe one call comes in and gets the port right and another comes in and gets it wrong. I find it unlikely but it might be something to look for. Also when you look at the logs does it show the music file playing for both calls?