Branch Id is required to identify the transaction. Hence for each new request 
branch id is different. BYE is used to disconnect the call/ dialog not 
transaction. Cancel is used to disconnect the transaction hence branch id of 
invite and cancel must be same.

Thanks and Regards 
Dheeraj Kumar 

Sent from iPhone

> On 20-Aug-2016, at 12:50 AM, NK <nitinkapo...@gmail.com> wrote:
> 
> Dear All,
> 
> As far as i know Branch Parameter in the VIA Header, must be unique for
> every new transaction.
> 
> Which means, when we send the BYE to any dialog, then the BRANCH parameter
> will be different as compare the Initial invite.
> 
> However i cannot see any document which stating the same.
> 
> Can you please let me know if my understanding is correct for this and if
> any senior can please share the document for this.
> 
> Thank you in advance.,
> 
> Regards,
> Nitin
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