> >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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