We've been having rtp issues and are using the latest nathelper, but the rtp proxy build is from last august-october. I'm assuming that is the reason for our RTP problems. :) I've seen a few posts to the mailing list stating that the latest CVS of rtpproxy is required for the new nathelper functions (on the CVS release of SER). However, I'm not sure how to download the CVS version of rtpproxy