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Hi, I have an Asterisk 1.8.2.3 installed (public IP) with a peer (Polycom IP601) installed behind NAT. When the peer makes a call, it's working without any problem. But when a call is coming back, it ends up with a Got SIP response 400 "Bad Request" back from xx.xx.xx.xx where the xx.xx.xx.xx is the public IP of the peer. And the call drops to the voicemail (congestion at peer