We have a working SIP Trunk with a SIP provider. For mobile traffic we have configured a Quescom gateway wich only handles traffic to predefined cell phone numbers. If a cell number is not configured in the quescom it has to fall back to the SIP connection. If this is the case we have one way audio! If i call the cell number directly without intervention of the Quescom the problem does not occure. I have some debugs of the SIP messages attached. I don't see anything strange.
