[SIPForum-discussion] Issue to use Tag

[Stephen James]

The tags (along with the CALL-ID) identify a dialog, please see RFC 3261 for 
complete description.
Since there can be more than one dialog in a "call" the call ID is not 
sufficient. 


The most obvious case is a forking situation, where the INVITE is forked and 
there are two 18x responses establishing a dialogue.
The From tag from the sender and each of the To tags from each of the responders 
would establish two dialogs under the same Call-id

Call-Id, From, ToA and Call-Id, From and ToB

 
Stephen James 
sjames_1958 at yahoo.com
 
We are not princes of the earth, we are the descendants of worms, and any 
nobility must be earned.





________________________________
From: Kareena K <kareenaf1 at gmail.com>
To: discussion at sipforum.org
Sent: Wed, September 26, 2012 5:23:34 PM
Subject: [SIPForum-discussion] Issue to use Tag

Hi all,

why tag(i.e to-tag and from-tag) had been used if we can identity the call by 
using Call-id.
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