I've got nathelper module and rtp proxy running. When I start up SER, the natmodule detects rtpproxy running so it enables the support for it. Something's not running right because I cannot establish a voice conversation between two user agents. I can, however, establish a connection between the two user agents. I included my ser.cfg file in a previous posting and can resend it to anyone who's interested in looking at it. Any help in trying to configure nathelper and rtpproxy properly would be greatly appreciated. Thanks in advance. Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers