Subject: Re: [Sip] UA CANCEL

From: [email-masked]
Date: Wed, 5 May 2004 11:51:20 +1000

Hey Keith,

Sending a CANCEL at this stage is entirely legitimate and the proxy should respond with a 487 and tear its calls down. A 406 should be generated in response to a problem with the Accept header field in the CANCEL. Could 
you post the CANCEL message?

HTH,

B

Ben Gatewood
Dimension Data Insite
SIP Wookie
Level 1 10 Dorcas Street South Melbourne
+61 3 9626 0735
+61 419 885 762
[email-masked]

Keith Anderson <[email-masked]>
Sent by: [email-masked]
05/05/2004 11:14 AM

        To:     [email-masked]
        cc: 
        Subject:        [Sip] UA CANCEL

Hi,

Can someone please let me know how the UAS should handle the Cancel in 
this
call scenario. In this scenario the UAC wishes to cancel the call before 
it
is answered and a 2xx has not been received. My understanding is that the
UAC only needs to send a BYE if the INVITE returns a 2xx. 

 147.76.36.65       147.76.36.205      147.76.36.69
|                  |                  | <Call><PFrame><Time>
|                  |                  |
| F1 INVITE (sdp)  |                  |
|>---------------->|                  |  1 PF:29  09:29:19.1780
|                  |                  |
| Session Progress 183 F2             |
|  Progress 183 F2 |                  |
|<----------------<|                  |  1 PF:30  09:29:19.1793
|                  |                  |
|                  | F3 INVITE        |
|                  |>---------------->|  2 PF:32  09:29:19.2051
|                  |                  |
|                  |    Trying 100 F4 |
|                  |<----------------<|  2 PF:33  09:29:19.2603
|                  |                  |
|                  |   Ringing 180 F5 |
|                  |<----------------<|  2 PF:34  09:29:19.3654
|                  |                  |
|   Ringing 180 F6 |                  |
|<----------------<|                  |  1 PF:35  09:29:19.4628
|                  |                  |
|   Ringing 180 F7 |                  |
|<----------------<|                  |  1 PF:45  09:29:20.4627
|                  |                  |
| F8 CANCEL        |                  |
|>---------------->|                  |  1 PF:83  09:29:26.1839
|                  |                  |
| Not Acceptable 406 F9               |
| cceptable 406 F9 |                  |
|<----------------<|                  |  1 PF:84  09:29:26.1846

Keith Anderson
NEC Business Solutions

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