[SIPForum-discussion] The missed Call with PRACK terminated using BYE or Cancel

[Stephen James]

Because it is not always CANCEL. ITU Q.1912.5 specifies BYE after confirmed dialog. 

Sent from my iPhone

> On Jan 28, 2014, at 22:50, pankaj Rajan <rajan.pankaj at gmail.com> wrote:
> 
> Hi All,
> 
>   Why we are talking about BYE and CANCEL?  Is UAC disconnecting before establish a call? If UAC is disconnecting a call then UAC will send CANCEL always.  Why i am asking because it is not mention in query description.
> 
> Best Regards,
> Pankaj Rajan 
> 
> 
>> On Fri, Jan 24, 2014 at 5:04 AM, Aniella Juverdeanu <Aniella.Juverdeanu at telus.com> wrote:
>> I don’t think is correct to have BYE – it should be CANCEL – I always see it. Another example is if the caller got announcement – 183 and PRACK – then CANCEL
>> 
>>  
>> 
>> From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Murali ZTE
>> Sent: January 17, 2014 11:50 PM
>> To: discussion at sipforum.org
>> Subject: [SIPForum-discussion] The missed Call with PRACK terminated using BYE or Cancel
>> 
>>  
>> 
>> Hello Guys,
>> 
>> I have one query regarding PRACK for the following scenario  my SIP client sending BYE message instead of Cancel.Is it right behavior? because the session is not established for the initial INVITE.or its behaving correctly because of PRACK.Could anyone explain this behaviour ?
>> 
>> UAC-------INVITE-------------->UAS
>> UAC<-----1xx------------------>UAS
>> UAC<-----180(Rseq)----------UAS
>> UAC--------PRACK(Rack)--->UAS
>> UAC<-----200 OK(PRACK)--UAS
>> UAC-------- BYE-------------->UAS
>> 
>> 
>> Thanks and Regards
>> Murali
>> 
>> 
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