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Re: [Linphone-developers] sdp in re-invite rfc 3261 14.1. Current suppor

From: Dave Harley
Subject: Re: [Linphone-developers] sdp in re-invite rfc 3261 14.1. Current support/intentions?
Date: Thu, 16 Jul 2009 18:20:10 +0100

Hi Simon,

I'll set up a test with the latest linphone and libraries.

I should clarify that the case I'm looking at is when a empty ( bodyless) re-invite arrives within an already fully established dialogue.  The expected ( well my expected ) behaviour is that the invite initiates a swap of SDP in the 200 ok response and resulting ack messages.  The ack sdp body indicated the remote end is going on hold ( using the depreciated " (c): IN IP4" I might add ).   xlite packet trace corroborates this.

I'll follow up with some results or at least a "Thanks, all works great".

Many thanks,


On Thu, 2009-07-16 at 17:25 +0200, Simon Morlat wrote:
Hi Dave,

Receiving of INVITEs and reINVITEs without SDP is implemented and it should 
work. I think it has been implemented shortly after the email you refer.
Try lastest release (3.1.2). This feature is not tested very often, just tell 
me if you find a bug.


Le jeudi 16 juillet 2009 16:17:32, Dave Harley a écrit :
> Hi All,
> There was a query about 2 years ago regarding receiving invites and
> re-invites with no sdp offer when interoping with a mitel.  It
> referenced 14.1 and 13.2.1 of RFC 3261.
> I'm running an old release of linphone which was happily doing its job
> up to now.  However recently it appears that I need to support the above
> against both a Mitel and an Aastra A5000 iPBX.
> At the time Simon pointed out he had no immediate intention of
> implementing this (from the original thread:
> ).
> Just wondering has this situation changed?  Is there any support in the
> top of the tree for this aspect of the RFC?
> I would test this myself before asking but getting access to the
> environment where it exhibits is... problematic.
> BTW I originally thought this was an osip issue and posted there. I was
> wrong and was, very helpfully, pointed in the right direction. So
> apologies if this mail seems familiar to any list members.
> Best regards,
> Dave

Dave Harley.Senior Systems Engineer

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