[SIPForum-discussion] regarding tag parameter in From header

[Vijay Tiwari]

Hello Nishant


1)      What is the uses of From tag in from header .
A dialog is identified by a call identifier, local tag, and a remote tag.
and From tag is local tag by the definition of Dialog.

2)      Is this mandatory in the initial INVITE message ? If not in which
case it will be optional ?

it is a mandatory in initial invite, if UAC  compliance of RFC 3261.

Thanks
vijay

On Wed, May 5, 2010 at 2:23 PM, Roy, Nishant Kishore <nishantkr at hp.com>wrote:

>  Hi All ,
>
>
>
> Can anyone help me out with following question :
>
>
>
> 1)      What is the uses of From tag in from header .
>
> AFAIK : it will be used in dialog creation which consist of tag from TO
> header and FROM header along with Call-ID , what else ?
>
>
>
> 2)      Is this mandatory in the initial INVITE message ? If not in which
> case it will be optional ?
>
>
>
> Regards
>
> Nishant
>
>
>
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