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Of course there are plenty of other caveats regarding cRTP and I have to say that I have seen very few people using cRTP instead of fully fledged RTP.

So in summary, on a good day VOIP suffers about 50% overhead but more typically (and realistically) runs at a monstrously efficient 200% and the irony is the big marketing push for VOIP (over full Quality of service protocols like ATM) was that it 'could' be much more efficient than ATMs 10% overhead.