Otherwise, the caller gets a callback from an unexpected source.

Philip Withnall authored Jul 02, 2014 and Olivier Crête committed Jul 07, 2014

If (agent->main_context == NULL) the sockets are created with a NULL
main context, which they then try to ref. That does not end well.

We want ICE-TCP to not have reliable behavior unless the agent
is reliable otherwise it will confuse existing VoIP applications.

Youness Alaoui authored Apr 15, 2014 and Olivier Crête committed May 17, 2014

In the case of TCP-ACTIVE, we don't have a problem, because the new
socket will generate a  peer-reflexive candidate with the right
sockptr, and all sends will go through it, but for TCP-PASSIVE, there
is no peer reflexive candidates, so once the pair is selected, the local
candidate will point to the TCP-PASSIVE candidate with the TCP_PASSIVE
socket type which will cause all sends to fail, so we need to proxy
them to the child connections