3G network we have taken trace using packet tracer from this we have observed the contact URI send by client is different when it received on server side.
Client send contact URI as Via: SIP/2.0/UDP 188.8.131.52:31568;branch=z9hG4bK-1505690283;rport
but on server side it Via: SIP/2.0/UDP 184.108.40.206:55045;branch=z9hG4bK-1505690283;rport
Here the ports number is vary becuase of that the call is failed in 3g network.
Please help me in this , what is the reason for this issue.
Note: we are using TURN server