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

[Banda, Srinivas (Srinivas)]

Hi Heino,

Bob has to send the PRACK message when it receives the 183(SDP2) with Require:100 Rel.

The reason why Alice not included the Require 100rel in 181 and first 183 is there is no SDP (media information) so it doesn't want reliability of those messages.
But the 183 with SDP2 is having the media information, then it is mandatory for reliability.

Regards
Srinivas

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Klier, Heino
Sent: Tuesday, November 12, 2013 5:45 PM
To: 'discussion at sipforum.org'
Subject: [SIPForum-discussion] Require 100rel in 18x Response

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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