Hi, I'm experimenting this real case very often: - Kamailio invokes "force_rtproxy()" for an INVITE and sets a flag(USE_RTPPROXY). - A CANCEL arrives (so I invoke "unforce_rtpproxy()"). - Inmediatelly a 183 arrives from downstream (before the UAS receives the CANCEL generated by Kamailio). - flag(USE_RTPPROXY) is set so I invoke "force_rtpproxy()" for the 183 response, and obviously I get this error from RtpProxy module (since the RtpProxy session was ended upon recepit of the CANCEL): ERROR:nathelper:force_rtp_proxy: incorrect port 0 in reply from rtp proxy Yes, nothing wrong happens, but I would like to avoid this error in the logs. Unfortunatelly when processing the incoming CANCEL kamailio cannot unset a flag in the related INVITE transaction, so I cannot do "resetflag(USE_RTPPROXY)" when receiving the CANCEL (it's not useful at all). So I cannot guess any way to do it, suggestions? Thanks a lot. -- Iñaki Baz Castillo <ibc(a)aliax.net>