No problems. You just have to make sure that your ser.cfg announces the public IP using record_route_preset("public_ip") and that you have an alias with the public IP. However, running mediaproxy or rtpproxy behind NAT requires a small patch to make sure the public and not listening address. See below for the patch for version 1.2.1, it adds a --vip option for you to specify the public IP to be used in the payload. g-) *** mediaproxy-1.2.1/mediaproxy.py 2005-01-24 18:54:54.000000000 +0100 --- ../mediaproxy/mediaproxy.py 2005-04-18 14:28:36.000000000 +0200 *************** *** 27,32 **** --- 27,35 ---- parser.add_option("--ip", dest="proxyIP", type="ip", default=None, help="use this IP to talk to the RTP parties (first found)", metavar="IP") + parser.add_option("--vip", dest="virtualIP", type="ip", default=None, + help="use this IP in SDP payload (for NATed mediaproxy servers)", + metavar="IP") parser.add_option("--ports", dest="ports", type='ports', default=(35000, 65000), help="rtp port range (35000:65000)", metavar="min:max") *************** *** 70,75 **** --- 73,79 ---- if options.listenAddr is not None: rtphandler.tcpListenAddress = options.listenAddr rtphandler.proxyIP = proxyIP + rtphandler.virtualIP = options.virtualIP rtphandler.minPort = options.ports[0] rtphandler.maxPort = options.ports[1] rtphandler.TOS = options.tos *** mediaproxy-1.2.1/modules/rtphandler.py 2005-02-04 22:31:24.000000000 +0100 --- ../mediaproxy/modules/rtphandler.py 2005-04-18 14:25:45.000000000 +0200 *************** *** 25,30 **** --- 25,31 ---- forceClose = 0 ## Close a sesion after this much time (0 for no timeout) proxyIP = '0.0.0.0' + virtualIP = '0.0.0.0' minPort = 35000 ## Must be even!!! maxPort = 65000 ## Must be even!!! crtPort = minPort ## Must be even!!! *************** *** 1076,1080 **** def endpointAddresses(self): '''Return the IP address and the RTP data port(s) that will be used by this session''' ports = [str(stream.rtpStream.addr[1]) for stream in self.mediaStreams] ! return " ".join([proxyIP] + ports) --- 1077,1083 ---- def endpointAddresses(self): '''Return the IP address and the RTP data port(s) that will be used by this session''' ports = [str(stream.rtpStream.addr[1]) for stream in self.mediaStreams] ! return " ".join([virtualIP] + ports) ! ! Alan wrote: