Re: [Sip-implementors] Canceling a pending INVITE

Biplab Chattopadhyay Tue, 31 Aug 2004 04:43:19 -0700

I just have one curiosity regarding canceling a transaction. RFC 3261 says CANCEL SHOULD be used for canceling INVITE txns, I also know for BYE it doesn't make sense. But in practice, is any of the UACs is using CANCEL, in any situation, to cancel any other type of transaction. If using, in what situation?

Biplab.

Markus Hofmann wrote:

Yes, that's make sense for me too

I refer to section 9.2 Server behavior:

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.

Greeting

Markus

[EMAIL PROTECTED] schrieb am 31.08.04 12:16:10:

Hi,
The following excerpt from rfc 3261 (Section 9.1) makes it clear:

  "Note that both the transaction corresponding to the original request
  and the CANCEL transaction will complete independently.  However, a
  UAC canceling a request cannot rely on receiving a 487 (Request
  Terminated) response for the original request, as an RFC 2543-
  compliant UAS will not generate such a response.  If there is no
  final response for the original request in 64*T1 seconds (T1 is
  defined in Section 17.1.1.1), the client SHOULD then consider the
  original transaction cancelled and SHOULD destroy the client
  transaction handling the original request."

-- Hope this makes the things clear - why 487 did not arrive.

Biplab.

Markus Hofmann wrote:

Hi Sam,

I think to send a "487 Request Terminated" is a SHOULD and not a MUST.

Greeting

Markus

sam n <[EMAIL PROTECTED]> schrieb am 31.08.04 03:42:20:

Hello,

I need to cancel an INVITE that was just sent, and am trying the
method indicated in RFC 3261. Below is a small log of the SIP messages
sent/received.


<send INVITE>

INVITE sip:[EMAIL PROTECTED] SIP/2.0
Call-ID: [EMAIL PROTECTED]
CSeq: 590812 INVITE
From: <sip:[EMAIL PROTECTED]>;tag=1508783231-1592972684
To: "1001" <sip:[EMAIL PROTECTED]>
Via: SIP/2.0/UDP 192.168.0.16:1099
Max-Forwards: 70
Contact: "gernot" <sip:[EMAIL PROTECTED]:1099>
User-Agent: C12 Phone
Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,UPDATE,NOTIFY
Content-Type: application/sdp
Content-Length: 159

// sdp body

<receive TRYING>

SIP/2.0 100 Trying
Via: SIP/2.0/UDP
192.168.0.16:1099;branch=z9hG4bK2a812a1942f6c5e7081b1c7505d45b8c
From: <sip:[EMAIL PROTECTED]>;tag=1508783231-1592972684
To: "1001" <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 590812 INVITE
Content-Length: 0


<receive RINGING>

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP
192.168.0.16:1099;branch=z9hG4bK2a812a1942f6c5e7081b1c7505d45b8c
From: <sip:[EMAIL PROTECTED]>;tag=1508783231-1592972684
To: "1001" <sip:[EMAIL PROTECTED]>;tag=1229238695-1093914397502
Call-ID: [EMAIL PROTECTED]
CSeq: 590812 INVITE
Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,REFER,UPDATE,NOTIFY
Supported: 100rel
Contact: <sip:192.168.0.170:5060>
Remote-Party-ID: "Jill
Tester"<sip:[EMAIL 
PROTECTED];user=phone>;screen=yes;party=called;privacy=off;id-type=subscriber
Content-Length: 0


<send CANCEL>

CANCEL sip:[EMAIL PROTECTED] SIP/2.0
Call-ID: [EMAIL PROTECTED]
CSeq: 590812 CANCEL
From: <sip:[EMAIL PROTECTED]>;tag=1508783231-1592972684
To: "1001" <sip:[EMAIL PROTECTED]>
Via: SIP/2.0/UDP 192.168.0.16:1099
Max-Forwards: 70
User-Agent: C12 Phone
Contact: "gernot" <sip:[EMAIL PROTECTED]:1099>
Content-Length: 0

<receive OK for CANCEL>

SIP/2.0 200 OK
Via: SIP/2.0/UDP
192.168.0.16:1099;branch=z9hG4bK4f4ef2cc44a8b287fda3dd08df6fdebd
From: <sip:[EMAIL PROTECTED]>;tag=1508783231-1592972684
To: "1001" <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 590812 CANCEL
Content-Length: 0

However, after this, i do not receive a 487 Request Terminated
response, and the remote user's phone proceeds to ring.

Could anyone kindly tell me where i'm going wrong.

Thanks in advance.

Regards, Sam _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors

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Biplab Chattopadhyay
Research Engineer
CDOT-Bangalore
email: [EMAIL PROTECTED]
      [EMAIL PROTECTED]
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----------------------------------------------------------------------------
Biplab Chattopadhyay
Research Engineer
CDOT-Bangalore
email: [EMAIL PROTECTED]
      [EMAIL PROTECTED]
Phone#
    Office: 2263399, ext 255
             2383951 (direct)
    Mobile: 9845378867
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Re: [Sip-implementors] Canceling a pending INVITE

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