[SIPForum-discussion] CANCEL request will be send from UAC toUASat that time what response UAC will get

Sun Apr 22 09:40:50 UTC 2007

About the response of CANCEL, this will depend on the differenct situation. Here is some information about the response of CANCEL from RFC3261:

  If the UAS did not find a matching transaction for the CANCEL
according to the procedure above, it SHOULD respond to the CANCEL
with a 481 (Call Leg/Transaction Does Not Exist). If the transaction
for the original request still exists, the behavior of the UAS on
receiving a CANCEL request depends on whether it has already sent a
final response for the original request. If it has, the CANCEL
request has no effect on the processing of the original request, no
effect on any session state, and no effect on the responses generated
for the original request. If the UAS has not issued a final response
for the original request, its behavior depends on the method of the
original request. If the original request was an INVITE, the UAS
SHOULD immediately respond to the INVITE with a 487 (Request
Terminated). A CANCEL request has no impact on the processing of
transactions with any other method defined in this specification.

Regardless of the method of the original request, as long as the
CANCEL matched an existing transaction, the UAS answers the CANCEL
request itself with a 200 (OK) response. This response is
constructed following the procedures described in Section 8.2.6
noting that the To tag of the response to the CANCEL and the To tag
in the response to the original request SHOULD be the same. The
response to CANCEL is passed to the server transaction for
transmission.

--sleepwalker
q w <sleepwalk_wu at yahoo.com.cn> 写道：
    Hi Alex,

  I agree with you. The purpose of CANCEL is cancel a request. It does not matter with the session issue.

  --sleepwalker

alexzhang at gdnt.com.cn 写道：
      @page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; }  P.MsoNormal {   FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"  }  LI.MsoNormal {   FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"  }  DIV.MsoNormal {   FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"  }  A:link {   COLOR: blue; TEXT-DECORATION: underline  }  SPAN.MsoHyperlink {   COLOR: blue; TEXT-DECORATION: underline  }  A:visited {   COLOR: purple; TEXT-DECORATION: underline  }  SPAN.MsoHyperlinkFollowed {     COLOR: purple; TEXT-DECORATION: underline  }  SPAN.EmailStyle17 {   COLOR: windowtext; FONT-FAMILY: Arial; mso-style-type: personal-compose  }  DIV.Section1 {   page: Section1  }      Hi Rui,

  I don't think so. Could you please give the evidence supporting your point?

  -- A l e x

---------------------------------
  From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of XuRui
Sent: Friday, April 20, 2007 3:25 PM
To: William Prusty; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] CANCEL request will be send from UAC toUASat that time what response UAC will get

  Hi,

  CANCEL should not be sent after session is established.
  If UAS does receives this CANCEL, I preferred send 481 response.

  Regards,
  Xu Rui

    ----- Original Message ----- 
  From: William Prusty 
  To: discussion at sipforum.org 
  Sent: Friday, April 20, 2007 2:50 PM
  Subject: [SIPForum-discussion] CANCEL request will be send from UAC to UASat that time what response UAC will get

    Suppose call has been established . if CANCEL request will be send from UAC to UAS at that time what response UAC will get 

  Plz answer ASAP

  With regards
                               william

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