Hi! This is just my own opinion. See inline That figures you need a conferencing capability. SER has little to do with it. All depends on how the clients will generate their INVITEs, which SER will handle appropriately. RTPproxy (as well as mediaproxy) is not a conferencing server but merely a node that helps NATed clients talk to each other, i.e. RTPproxy is a relay node. That's all. If you are looking for a conferencing software for audio, I would recommend using Asterisk. As for vdo and other multimedia, I have a little idea because, myself, Im struggling to find it. Regards, Andrey.