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[Sip] REFER ABNF issues

I noticed two minor issues that with REFER related to the ABNF:

Is there any reason that  Refer-To syntax is not the following:

Refer-To = ("Refer-To" | "r") ":" ( URL | name-addr | addr-spec )

There are some nice UI reasons to want to put the display name
in the Refer-To field.  This also makes the parsing a little more
tolerant of implementions that mistakenly put the name-addr in
the Refer-To  field.

Also should we use the absoluteURI construct as opposed to
URL and reference bis for the definition as this provides a
more concrete parsing syntax than is currently defined in
the refer draft.



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