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

Tue Nov 19 00:31:16 UTC 2013

When Alice sent 183 message with SDP, Alice expects PRACK as relaibility
check. This is the meaning for 100 rel required, means, reliably sent the
SDP. So, you need to check why PRACK is not sending by Bob.

On Tue, Nov 12, 2013 at 4:15 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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