Subject: RE: [Sip] CANCEL and 100 Trying Question

From: [email-masked]
Date: Tue, 26 Feb 2002 12:19:00 +0200

> -----Original Message-----
> From: ext Fuxbruner, Amihay [mailto:[email-masked]]
> Sent: Tuesday, February 26, 2002 11:44 AM
> To: [email-masked]
> Subject: [Sip] CANCEL and 100 Trying Question
> 
> 
> Hello,
> 
> Probably answered long ago, but I couldn't find it :-(
> 
> 2543 says UAC sends CANCEL after receiving 1xx only, to 
> prevent the case
> where UAS get CANCEL before INVITE.
> In case UAC sends CANCEL after receiving 100 from next proxy, 
> still UAS may
> get CANCEL before INVITE.
> 
> Is this correct?

No, The CANCEL following the exact path as the INVITE. 

From section 9.1 "The destination address,
   port, and transport for the CANCEL MUST be identical to those used to
   send the original request."

regards,
Hisham

> 
> Thanks,
> 
> Amihay Fuxbruner
> System Engineering - Signaling R&D
> Comverse
> 
> 
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