Hi, I've tried to use portaone rtpproxy with nathelper, but it looks there is interoperability problem. # export CVSROOT=:pserver:anonymous@cvs.berlios.de:/cvsroot/ser # cvs co -r rel_0_8_12 sip_router # (cd sip_router; make install) # cvs co rtpproxy # (cd rtpproxy; ./configure; make install) # cp sip_router/etc/nathelper.cfg /usr/local/etc/ser/ser.cfg After editing ser.cfg to fit my site and starting ser and rtpproxy, when I tried to make a call from an endpoint A behind NAT to endpoint B behind NAT, signaling was OK(endpoint was ringing), but no media. In my /var/log/messages, following message appeared. "ERROR: send_rtpp_command: can't connect to RTP Proxy" So I traced rtpproxy process by "strace -p <rtpproxy's PID> -f -F", then I saw "rtpproxy: command syntax error:" message. I think there are no message format compatibility between sip_router (branch rel_0_8_12) and rtpproxy(latest). Should I use another version to work them together? Regards, -- zaki