[SIPForum-discussion] 100 Tring for Re-invite

[Manpreet Singh]

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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