[SIPForum-discussion] Issue to use Tag

[Dinesh Rao]

But proxies don't deal with tags and call ID's, they use branches to
distinguish different transaction.Only UAC/UAS knows about call ID and tags.

Regards
C.Dinesh
On Fri, Sep 28, 2012 at 12:22 AM, Stephen James <sjames_1958 at yahoo.com>wrote:

> Since 18x can establish early dialog then it is pertinent to that time.
>
> Sent from my iPhone
>
> On Sep 27, 2012, at 13:36, Dinesh Rao <dinesh2022 at gmail.com> wrote:
>
>
> Hi Stephen,
>
> I have one question to you.As you said, In case of forking for two 18x
> responses there will be 2 unique totags.Bu there is branch parameter too in
> the via headers which is used by proxies to distinguish between two forked
> calls before dialog establishment.I think tags and callid is something used
> after dialog is established but before dialog establishment, branches are
> used to distinguish different transaction in case of forking before dialog
> establishment.Please correct me if I am wrong.
>
> Regards
> C.Dinesh
> On Thu, Sep 27, 2012 at 4:54 PM, Stephen James <sjames_1958 at yahoo.com>wrote:
>
>> 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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>>
>
>
> --
> *C.Dinesh*
> Sr. Software Engineer
> Panterra Networks
>
>


-- 
*C.Dinesh*
Sr. Software Engineer
Panterra Networks
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