[SIPForum-discussion] About branch and tag id in sip header

[Gopalarathnam Sambasivan]

Just to add,
Call-ID - For a dialog,  i.e., INVITE, PRACK, ACK, BYE all have same
call-ID.
Via header branch parameter - per transaction.
i.e.,  a INVITE, its 100 Trying, 180 Ringing, its 200 OK is same (1)
ACK is different(2), PRACK and its 200 OK is different(3), BYE is
different (4) all of which
can be for the same dialog.

Please Read RFC3261 - for more info.


On 8/17/07, rama kumar <ramakumard at yahoo.co.in> wrote:
>
> Call-ID header is used to identify the dialog and it is unique to that
> dialog.
>
> Branch Id is a parameter which is a part of Via Header. This is used to
> identify the perticular transaction created by the request.
>
> Thanks,
> Ramakumar D
>
>
> *Asha Pillai <asha.g.pillai at gmail.com>* wrote:
>
> I just want to know wat is the basic difference between tah branch id and
> call id.
>
> also in rfc its written that during registration between UAC and registrar
> always call id is unique for that combination.Is it like that for only
> REGISTER message
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