> and to TUN the long tail of nodes for which NAT traversal doesn't work. There is no true P2P on today's NAT'ed Internet.
The bigger problem, which affects all nodes even if they can establish direct connectivity, is just the bandwidth requirements of true P2P videoconferencing once you have more than a few participants in the meeting. People often find out that even a connection marketed as "1Gbit fibre" likely has unacceptable loss/delay/jitter once they try to transmit, say, 50Mbit/s of UDP at a high packet rate to a variety of international destinations at the same time.
The bigger problem, which affects all nodes even if they can establish direct connectivity, is just the bandwidth requirements of true P2P videoconferencing once you have more than a few participants in the meeting. People often find out that even a connection marketed as "1Gbit fibre" likely has unacceptable loss/delay/jitter once they try to transmit, say, 50Mbit/s of UDP at a high packet rate to a variety of international destinations at the same time.