[SIPForum-discussion] 100 Tring for Re-invite

[hemanth kumar]

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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