[SIPForum-discussion] 100 Tring for Re-invite

[Mehul Jain]

If INVITE does NOT have a To Tag then the 100 Tring SHOULD NOT have one.
If INVITE does have a To Tag : Then the 100 Trying will also have one.
 
17.2.1 INVITE Server Transaction
The 100 (Trying) response is constructed according to the procedures in
Section 8.2.6 <http://www.apps.ietf.org/rfc/rfc3261.html#sec-8.2.6> ,
except that the insertion of tags in the To header field of the response
(when none was present in the request) is downgraded from MAY to SHOULD
NOT. 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of hemanth kumar
Sent: Wednesday, November 08, 2006 7:53 PM
To: Manpreet Singh; Rajangam.Subramanian at alcatel.com;
discussion at sipforum.org
Subject: Re: [SIPForum-discussion] 100 Tring for Re-invite


Hi,
 
100 Trying is built from the INVITE message. As the reINVITE would have
all the information related to a dialog, 100 Trying for reINVITE would
be generated based on the reINVITE. Hence it would have all the
information related to dialog
including To-tag.
 
Regards
Hemanth

Manpreet Singh <msingh at ibasis.net> wrote:

	I believe the 100 Trying to the Re-invite must carry the To-Tag.
It doesn't explicitly say anywhere for 100trying whether it can or
cannot carry  a To-Tag when the INVITE carries it. It does say its
optional to send for 100trying when the initial invite didn't carry one.
So I guess the rules in section 8.6.2 in rfc 3261 would apply for
100Trying for a re-invite. 
	Manpreet 
	-----Original Message----- 
	From: Rajangam.Subramanian at alcatel.com
[mailto:Rajangam.Subramanian at alcatel.com] 
	Sent: Thursday, October 19, 2006 3:29 PM 
	To: discussion at sipforum.org 
	Subject: [SIPForum-discussion] 100 Tring for Re-invite 
	Hello all, 
	    I a query related to 100 Trying response for RE-Invite
message. 
	The following is the scenario. A and B are 2 SIP UA's. A
successful SIP call is established between A and B. 
	Now A wants to invoke some service and sends a Re-INVITE to B. 
	This Re-Invite to B will have a valid"To-tag" in the To header
(as this is a re-invite) 
	B sends a 100 Trying for this RE-Invite. 
	My Question is: Is it necessary for  this 100 Trying to
Re-Invite to have To-tag. Or can UA B send a 100 trying with out a
to-tag.
	        
	Regards, 
	Rajangam 
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