Subject: [Sipping] Why no To-Tag for Cancel Request?

From: Hai-dang Pham <[email-masked]>
Date: Fri, 23 Aug 2002 11:17:45 -0400

Hi all,

	I am wondering why CANCEL request (F9) don't use the To-Tag received
in the 180 response (F8)?  This call flow is from
draft-ietf-sipping-call-flows-00.txt section 3.2.1 Unsuccessful SIP to SIP
no answer.

   User A          Proxy 1          Proxy 2          User B 
     |                |                |                | 
     |   INVITE F1    |                |                | 
     |--------------->|   INVITE F2    |                | 
     |    (100) F3    |--------------->|   INVITE F4    | 
     |<---------------|    (100) F5    |--------------->| 
     |                |<---------------|                | 
     |                |                |      180 F6    | 
     |                |     180 F7     |<---------------| 
     |     180 F8     |<---------------|                | 
     |<---------------|                |                | 
     |                |                |                | 
     |   CANCEL F9    |                |                | 
     |--------------->|                |                | 
     |     200 F10    |                |                | 
     |<---------------|   CANCEL F11   |                | 
     |                |--------------->|                | 
     |                |     200 F12    |                | 
     |                |<---------------|                | 
     |                |                |   CANCEL F13   | 
     |                |                |--------------->| 

   F8 180 Ringing Proxy 1 -> A 
    
   SIP/2.0 180 Ringing 
   Via: SIP/2.0/UDP here.com:5060;branch=z9hG4bK74bf9 
    ;received=100.101.102.103 
   Record-Route: <sip:ss2.wcom.com;lr>, <sip:ss1.wcom.com;lr> 
   From: BigGuy <sip:[email-masked]>;tag=9fxced76sl 
   To: LittleGuy <sip:[email-masked]>;tag=314159 
   Call-ID: [email-masked] 
   CSeq: 1 INVITE 
   Contact: <sip:[email-masked]> 
   Content-Length: 0 
 
   F9 CANCEL A -> Proxy 1 
    
   CANCEL sip:[email-masked] SIP/2.0 
   Via: SIP/2.0/UDP here.com:5060;branch=z9hG4bK74bf9 
   Max-Forwards: 70 
   From: BigGuy <sip:[email-masked]>;tag=9fxced76sl 
   To: LittleGuy <sip:[email-masked]> 
   Call-ID: [email-masked] 
   CSeq: 1 CANCEL 
   Content-Length: 0 

Can somebody direct me to the section(s) in RFC3261 that explains this?

Thanks you,

Hai-Dang

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