And in case you were asking from UAS perspective and want to be backwards
compatible...
RFC 3261 section 12.1.1:
"A UAS MUST be prepared to receive a
request without a tag in the From field, in which case the tag is
considered to have a value of null.
This is to maintain backwards compatibility with RFC 2543, which
did not mandate From tags."
> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Brett Tate
> Sent: Friday, January 13, 2012 8:06 AM
> To: Marvic Sammut; [email protected]
> Subject: Re: [Sip-implementors] tag in FROM
>
> > >From RFC 3261
> > Section 8.1.1.3 specifies:
> >
> > "The From field MUST contain a new "tag" parameter, chosen by the
> UAC.
> > See Section 19.3 for details on choosing a tag.
> >
> > For further information on the From header field, see Section
> > 20.20."
>
> <snip>
>
> > Is the tag parameter required (in which case the ABNF is wrong) ?
>
> Yes; RFC 3261 requires the From tag. RFC 2543 did not require it.
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