Subject: [Sip] UA CANCEL

From: Keith Anderson <[email-masked]>
Date: Wed, 5 May 2004 11:14:53 +1000

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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