Gcc, When dealing with NATed SIP clients you have to handle their RTP (aka, audio and/or video) in a special manner. The reason is that the two SIP UAs in the call cannot directly talk to each other. SER offers two solutions namely rtpproxy and mediaproxy. These are complete independent of each other and both have pros and cons. You can run either of these proxies on physically different servers from SER. So to answer your first question, yes this is a good way. It's not necessarily a good thing to run these media proxies on the same physical server as SER, but nonetheless it's better than no audio. To answer your question about video, the answer, AFAIK, is yes. Both rtpproxy and mediaproxy support streaming video. I've never tried video, but there should be nothing special to do. If you search the serusers mailing list archives you'll likely find other postings related to video. Regards, Paul On 4/13/05, gcc chentob <chentob_gcc(a)hotmail.com> wrote: