[SIPForum-discussion] INVITE without SDP and 1XX provisional answer with SDP

[Jean-François Gaud]

User B is guilty.

If the initial offer is not present in the initial INVITE, it should
be in the first reliable message, without PRACK support that would be
a 200 OK message.

Check §13.2.1 in RFC 3261 for details.

Regards,

Jean-François Gaud.

> Jean-Sébastien Decubber <js.decubber at gmail.com> wrote:
>
> Dear All,
>
> I am currently doing some interworking test between two CPE. For a very
> specific scenario I reach the following call flow:
>
> 1) User A sends an INVITE without SDP to user B.
> 2) User B answers with a 183 session progress with SDP.
>
> So user B wants to send early media, but at this stage it doesn't where to
> send it because user A doesn't send any SDP in the invite.
> I know that PRACK mechanism can be used for this kind of scenario. But I
> would like to know if there is any RFC defining scenario?
> If the user A doesn't put the 100 rel tag in the INVITE (meaning that it
> doesn't support PRACK), is user B allowed to send this 183 SP with SDP?
>
>  Is there any "official way" to support this scenario (so I can try to know
> who is the guilty one)??
>
> Thanks and regards,
> Jean-Sébastien
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> Cheers p.sylvester |
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