I change the SipPort in Sip.xml to 5160 because the port 5060 is already used by another service (a SIPProxy).
I use FMG to make one call through a SipGateway.
When FMG call the gateway, it used the port 5060. When the call is done, FMG send a ACK to the SipGateway and specify as contact "sip:username@FMG_IP:5160".
When the call is hangup (in the otherside), the SipGateway send the BYE message to sip:username@FMG_IP:5160 and in wirehshark log I see that the port 5160 is not reachable.
Is there a way to this ? Or is it possible to disable the SipPort to bind (i need it only for outbound calls).