[SIPForum-discussion] Require 100rel in 18x Response

[Lokesh Reddy]

Hi heino,

  If 100rel present in INVITE that has an offer and UAS sends answerer SDP
IN any provisional response with SDP. we should acknowledge with sending
PRACK .

Regards,
Lokesh
On Nov 19, 2013 3:45 AM, "Klier, Heino" <Heino.Klier at qsc.de> wrote:

> Hi all,
>
> I am struggeling with some 100rel issues. The message flow is as follows:
>
> Bob -------- INVITE (SDP1)Support: 100rel ------> Alice
> Bob <-------  181   ------- Alice
> Bob <-------  183   ------- Alice
> Bob <-------  183 (SDP2) Require: 100rel  <------ Alice
> Bob does NOT answer with a PRACK and as part of this the call fails.
>
>
> Only in the third provisional response there is a Require 100rel header,
> but Bob doesn't answer with a PRACK Message.
> I do not find any information in RFC's if this behaviour is allowed and
> which UA is doing wrong in 100rel handling (Bob or Alice).
>
> Could anybody please give some advice?
>
> Thanks and Regards
> Heino
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