[Bug 29359] Freephonie doesn't work any more using SofiaSIP with Empathy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29359

Mikhail Zabaluev <mikhail.zabaluev at nokia.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
           Keywords|NEEDINFO                    |
         Resolution|                            |NOTABUG

--- Comment #4 from Mikhail Zabaluev <mikhail.zabaluev at nokia.com> 2010-08-04 09:07:18 PDT ---
Thanks for the information provided.
Please set the transport parameter to UDP in your account settings.

The reason it has "regressed" probably is in the heuristics that the SIP stack
uses to switch from UDP to TCP when the packet size becomes too big, as is
often the case with INVITE containing an authentication response and an SDP
session.
With some recent changes, we produce more of the SDP, and this exceeds the
limit for a reasonable size of UDP packets in the stack, so it switches to TCP,
which the proxy fails to support. Locking down the transport to UDP should
resolve this problem, at the cost of somewhat higher failure rate due to losses
of fragmented jumbo packets.

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