The SIP engine should only set the candidates on farsight when the users accepts the call and it sends its acceptation to the other side. Otherwise libnice will time out before the call has even started.
I'm not sure if papyon or butterfly should do it, what happens currently is that: papyon/media/stream.py:process_remote_description() calls process() which give the remote candidates to the buttefly handler and sets them. This should not happen before the user has accepted. Either butterfly needs to hold onto them until the user accepts, or papyon needs to do it.
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