This is a module to help with NATi [1] traversal. In particular, it helps symmetric UAs that don't advertise they are symmetric and are not able to determine their public address. fix_nated_contact rewrites Contact header field with request's source address:port pair. fix_nated_sdp adds the active direction indication to SDPi [2] (flag 0x01) and updates source IP address too (flag 0x02).

Maxim Sobolev