[Rtcomm] [Rtcomm] [Bug 2756] DTMF doesn't work after SIP call is initiated

Thu Sep 4 13:46:10 EEST 2008

https://bugs.maemo.org/show_bug.cgi?id=2756

mikhail.zabaluev at nokia.com changed:

           What    |Removed                     |Added
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                 CC|                            |olivier.crete at collabora.co.u
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------- Comment #14 from mikhail.zabaluev at nokia.com  2008-09-04 13:46 GMT+3 -------
(In reply to comment #10)
> THIS BUG HAS ABSOLUTELY NOTHING TO DO WITH GRANDCENTRAL! (Yes. I'm yelling!)

I'm sorry to say it has. Both bug reports have no mention of problems anywhere
other than with GrandCentral C2C, there are other clients that exhibit the same
problem with this service, and we've confirmed our DTMF works with some other
services (e.g. 611 at Gizmo). My best guess, in absence of packet dumps so far,
is GrandCentral (or Gizmo?) proxy advertises support for 'telephone-event'
payload (RFC 4733), but the media gateway doesn't actually propagate the DTMF
events to the other side. This is corroborated by a comment to the discussion
linked by Eric in comment #7, that switching temporarily to in-band DTMF solves
the problem.

Olivier, is there a way to disable telephone-event support in Farsight 1, to
try as a crude workaround?

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