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

[Stephen James]

Once the INVITE contains a Supported:100rel it is at the discretion of the UAS whether to ask for PRACK.
Generally, responses with bodies that must be received by the UAC are sent with Require: 100rel
Not having the exact details on the 183, this looks to be a uac problem.

Stephen James 
sjames_1958 at yahoo.com
 
We are not princes of the earth, we are the descendants of worms, and any nobility must be earned.


--------------------------------------------
On Tue, 11/12/13, Klier, Heino <Heino.Klier at qsc.de> wrote:

 Subject: [SIPForum-discussion] Require 100rel in 18x Response
 To: "'discussion at sipforum.org'" <discussion at sipforum.org>
 Date: Tuesday, November 12, 2013, 6:15 AM
 
 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
 _______________________________________________
 This is the SIP Forum discussion mailing list
 TO UNSUBSCRIBE, or edit your delivery options, please visit
 http://sipforum.org/mailman/listinfo/discussion
 Post to the list at discussion at sipforum.org