[Bug 28124] Placing calls works, Receiving gets stuck on "connecting" after answering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28124

--- Comment #8 from Christoph Böhme <christoph at b3e.net> 2010-07-01 13:19:22 PDT ---
I came across exactly the same problem: outbound calls work fine but on inbound
calls empathy gets stuck during "Connecting..." when I am behind my NAT-enabled
router.

Sniffing the communication between empathy and my sip provider revealed the
cause of the problem: On outbound calls empathy starts sending RTP packets as
soon as the connection is established; on inbound calls, however, it waits for
the first incoming RTP packet before sending any RTP packets itself. But since
I am behind a NAT no packet will ever be received unless something is sent
first.

This is not a problem with the STUN configuration which is working fine.
Empathy also uses the correct IP addresses and port numbers. The only problem
is that it does not always send an RTP packet and thus fails to traverse
restricted cone NATs.

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