Re: [Linphone-users] Re: Incorrect m=video media-field in 200 OK SDP

[Alastair Johnson]

On Tuesday 29 March 2011, Ivan Khvatov wrote:
> Hello.
> 
> Any comments/ideas? Maybe advice how to report this issue to developers?

The developers read this list, but are sometimes slow to respond. Perhaps they 
only look every week or two. I expect the response will be something like 
'thanks for the detailed bug report, fixed for next release, or in git if you 
need it now' but you might have to wait for it.

> Please, help.
> 
> On 25.03.2011, at 19:07, Ivan Khvatov wrote:
> > Hello all.
> > 
> > Linphone 3.4.2 in audio mode sends incorrect SDP message on incoming
> > video-calls. Specially, video media-field does not match the RFC4566
> > grammar.
> > 
> > Part of SDP message in 200 OK message from Linphone (full trace see in
> > debug logs in footer of this email): """
> > m=video 0 RTP/AVP
> > a=inactive
> > """
> > 
> > media-field grammar:
> > """
> > media-field =         %x6d "=" media SP port ["/" integer]
> > 
> >                      SP proto 1*(SP fmt) CRLF
> > 
> > """
> > 
> > i.e.: m=<media> <port> <proto> <fmt> ...
> > 
> > So, at least one "fmt" field is required. By the way, older Linphone
> > (3.3.2) does not put m=video in this case. Linphone 3.4.2 and 3.3.2 uses
> > same version of eXosip2 library (according User-Agent header version is
> > 3.3.0).
> > 
> > 
> > How to reproduce:
> > 1. Switch Linphone to "Audio only" mode.
> > 2. Make video call to Linphone.
> > 3. Answer call on Linphone.
> > 
> > 
> > Actual results:
> > Call establishing fails. Remote party did not understand SDP in 200 OK
> > reply and drop call.
> > 
> > 
> > Expected results:
> > Successfully established audio call.
> > 
> > 
> > Linphone version: 3.4.2
> > Linphone 3.3.2 works fine.
> > 
> > 
> > Debug logs:
> > 
> > Linphone 3.4.2 debug log (from startup to test call, call failed):
> > http://dev.sgu.ru/pub/linphone-3.4.2-audio-only.log
> > 
> > Linphone 3.3.2 debug log (from startup to test call, successful call):
> > http://dev.sgu.ru/pub/linphone-3.3.2-audio-only.log
> > 
> > I hope that this is right mailing list for this report. If not, let me
> > know.