Hi,
I've just committed major update for rtpproxy/nathelper, which adds support for proxying RTCP and also make RTP proxy behave much better for non-NATed clients by pre-loading remote addresses[1] of each party from the SIP request/reply. Please note that proxy's command protocol has been extended to support new functionality, so that you need both new rtp proxy and new nathelper (old nathelper will not work with new rtp proxy and vice versa). Both of them can be obtained from the ser's cvs repository:
http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/rtpproxy/ http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/sip_router/modules/nathelper/
Please let me know if there are any problems with the new version.
-Maxim [1] currently only IPv4 addresses can be pre-loaded, though it should be trivial to extend proxy, nathelper and command protocol to accomodate IPv6 as well. Proxy's core supports IPv4<->IPv4, IPv4<->IPv6 and IPv6<->IPv6 relaying already both for RTP and RTCP.