Hi,
i am using version 1.0.
I already identified and fixed the problem.
According to RFC 4566 (5. SDP Specification, page 10), if we put the "a=sendonly" before any media line (like "m=audio"), it is at session level and it affects all media lines.
So the following:
...
a=sendonly
m=audio .....
...
m=video ...
...
Is the same as:
...
m=audio ...
a=sendonly
...
m=video ...
a=sendonly
...
I did not check recent versions, but PJSIP 1.0 is not handling correctly the "a=sendonly" before any "m=audio".
In order to fix this i changed the function "update_media_direction" of sdp_neg.c. Every time a "a=sendonly" appears before any "m=audio", i remove it and put it in all "m=audio" that does not have the "a=sendonly".
(When i say "a=sendonly" i mean any of the following values: "a=sendrecv", "a=sendonly", "a=recvonly" or "a=inactive")
My solution is not the best one, but i can provide the patch if requested.
cheers,
Rafael Maia
> Date: Thu, 26 Nov 2009 13:48:11 +0700
> From: bennylp@xxxxxxxxx
> To: pjsip at lists.pjsip.org
> Subject: Re: SDP negotiation: Call hold problems
>
> On Wed, Nov 25, 2009 at 10:44 PM, Rafael Maia <rmaia_lcm at hotmail.com> wrote:
> > Hi,
> > i am having problems debugging an SDP negotiation related to call hold.
> >
> > I receive a an INVITE with the following lines of SDP from an unknown user
> > agent:
> >
> > ...
> > a=sendonly
> > m=audio 36884 RTP/AVP 8 101
> > c=IN IP4 10.184.13.134
> > ...
> >
> >
> > PJSIP replies incorrectly with a 200 OK "sendrecv":
> >
> > ...
> > m=audio 57928 RTP/AVP 8 101
> > a=rtpmap:8 PCMA/8000
> > a=sendrecv
> > ...
> >
> > The "sendonly" is replied with a "sendrecv".
> > According to RFC 4566 (5. SDP Specification, page 10), if a "a=sendonly" is
> > put at a session level it affects all media sessions ("m=").
> >
> > Can anyone tell me if PJSIP supports the "a=sendonly" at session level ?
> >
>
> We support call hold with sendonly/recvonly. As usual, to find out
> what the problem is, please state the PJSIP version that you're using
> and send us the log.
>
> Cheers
> Benny
>
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