[SIPForum-discussion] Issue to use Tag

[Abhisek Acharya]

Hey Kareena,

RFC says call-id is not unique but the From-tag,To-tag and Call-id makes a
unique ID which is called as Dialogue ID.Now Tags differentiate the From
and To party.
Consider a scenario where a single INVITE is forked by a state-full proxy
and INVITE goes to multiple destinations.And Proxy gets multiple
provisional responses from different end users.

How the proxy will differentiate between different end points.It has to be
a different To-tag from different end users as From tag will be same for
all the forked INVITES.


Hope this clarifies your query.

Abhisek Acharya
GS-LAB
PUNE




On Wed, Sep 26, 2012 at 11:58 AM, Kareena K <kareenaf1 at gmail.com> wrote:

> Hi all,
>
> why tag(i.e to-tag and from-tag) had been used if we can identity the call
> by using Call-id.
>
>
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20120927/20a348e3/attachment-0002.html>