Hello everybody I want to use nathelper/rtpproxy to IPv4/IPv6 interworking, but I'm having some problems. I use ser 0.8.13-dev-29 (latest from cvs) and latest rtpproxy (20040107) Ser config file is the same than nathelper example 4to6.cfg Ser starts ok, UA's registers ok. INVITE, 100 Trying, 180 Ringing are ok. Nathelper rewrites SDP bodies ok. When UA2 answer, it sends 200 ok, UA1 receives 200 OK and sends ACK. This ACK is my problem, because SER drops it, and never gets UA2. I suppose that's a problem from my config file, but I can't figure out what. Could you help me, please? Thank you very much.