Subject: Re: [Sip] UA CANCEL

From: [email-masked]
Date: Wed, 5 May 2004 13:33:16 +1000

Hey Keith,

My first suspicion would be that your proxy is having trouble with the Accept-Language header. This could lead it to throw a 406. The header is probably 
redundant anyway unless you are trying to say that you will only accept English.

Incidentally, there are a couple of other odd things about the CANCEL:

The sip-cc, sip-cc-01 and replaces option tags in the Supported header don't appear to be registered with IANA 
(http://www.iana.org/assignments/sip-parameters) and therefore shouldn't 
be used, as I understand it.

The Via header has no Branch parameter. Section 8.1.1.7 of 3261 states there MUST 
be a Branch parameter present. Furthermore, the Branch parameter for a 
CANCEL request MUST match the Branch parameter of the request it is trying 
to cancel.

HTH,

B

Ben Gatewood
Dimension Data
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 12:15 PM

        To:     "[email-masked]'" <[email-masked]>
        cc:     [email-masked], [email-masked]
        Subject:        Re: [Sip] UA CANCEL

Hi Ben,

Here is the cancel message.

SIP MESSAGE 8        147.76.36.65:1035() -> 147.76.36.205:5060()
UDP Frame 83       13/Feb/04 09:29:26.1839 TimeFromPreviousSipFrame=5.7213
TimeFromStart=7.0059 
CANCEL sip:[email-masked] SIP/2.0 
From: sip:[email-masked];tag=1c13752 
To: sip:[email-masked] 
Call-Id: [email-masked] 
Cseq: 1 CANCEL 
Accept-Language: en 
Supported: sip-cc, sip-cc-01, timer, replaces 
User-Agent: Pingtel/2.1.11 (VxWorks) 
Date: Tue, 07 Nov 2000 05:10:24 GMT 
Via: SIP/2.0/UDP 147.76.36.65 
Content-Length: 0

Keith Anderson
NEC Business Solutions

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