This FAQ entry is woefully out of date.

With bis-09, the branch ID in the Via header is a transaction 
identifier, correlating a request and its response (and possibly the 
ACK). These identifiers are hop-by-hop. The tags in the To and From 
fields are used to identify the dialog, and they are end-to-end.

-Jonathan R.

KANUMURI Sreeram wrote:
> go threw this link 
> http://www.cs.columbia.edu/sip/faq/cache/24.html  of SIP-FAQ
> 
> -Sreeram
> 
> 
>>-----Original Message-----
>>From: gaou yasser [SMTP:[EMAIL PROTECTED]]
>>Sent: Wednesday, June 05, 2002 1:44 AM
>>To:   [EMAIL PROTECTED]
>>Subject:      [Sip-implementors] Information about SIP
>>
>>I would like you to please explain in details,what
>>"branch" and "tag"?
>>How does one get the values?
>>Thank you
>>
>>
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-- 
Jonathan D. Rosenberg, Ph.D.            72 Eagle Rock Avenue
Chief Scientist                         First Floor
dynamicsoft                             East Hanover, NJ 07936
[EMAIL PROTECTED]                 FAX: (973) 952-5050
http://www.jdrosen.net                  PH:  (973) 952-5000
http://www.dynamicsoft.com

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