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Re: [Linphone-users] SDP in INVITE, RFC3261


From: Simon Morlat
Subject: Re: [Linphone-users] SDP in INVITE, RFC3261
Date: Thu, 9 Aug 2007 12:05:50 +0200
User-agent: KMail/1.9.7

Hi,

The complaint is right: linphone does not support incoming INVITEs without SDP 
and thus rejects the call.
It's not big job to implement it but I have no concrete plan to do it, since 
I 've already lots of other things to do.


Simon


Le Monday 06 August 2007 14:52:43 Rob Ezendam, vous avez écrit :
> Dear all,
>
>
>
> We are trying to connect linphone to a Mitel 3300 telephone system.
>
> >From the developers of Mitel we got the following complaint:
> >
> >
> >
> >From looking at the failed calls traces, it would appear that Linphone
>
> SIP stack is not following RFC 3261. The 3300 SIP lineside does not
>
> offer SDP in the initial invite and the Linphone does not like this nor
>
> does it respond back accordingly. It should offer it's SDP capabilities
>
> when it receives an INVITE without SDP. When the 3300 creates the
>
> initial INVITE, the transaction rules surrounding SDP are:
>
> ________________________
>
> RFC 3261 13.2.1 Creating the Initial INVITE For the initial INVITE
>
> transaction, the rules are:
>
> 1- The initial offer MUST be in either an INVITE or, if not there, in
>
> the first reliable non-failure message from the UAS back to the UAC. In
>
> this specification, that is the final 2xx response.
>
> ...
>
> 3- If the initial offer is in the first reliable non-failure message
>
> from the UAS back to UAC, the answer MUST be in the acknowledgement for
>
> that message (in this specification, ACK for a 2xx response).
>
> ...
>
> Concretely, the above rules specify two exchanges for UAs compliant to
>
> this specification alone - the offer is in the INVITE, and the answer in
>
> the 2xx (and possibly in a 1xx as well, with the same value), or the
>
> offer is in the 2xx, and the answer is in the ACK. All user agents that
>
> support INVITE MUST support these two exchanges.
>
>
>
>
>
>
>
> Are there plans to make linphone more compliant to RFC 3261?
>
>
>
>
>
> Kind regards,
>
> Rob Ezendam






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