Hi there,
I have just submitted a new version of the draft
http://www.ietf.org/internet-drafts/draft-loreto-sipping-3892bis-01.txt
it explains the needs for the
Referred-By header to be extended to to support more than one value:
In fact as explained in the draft the Referred-by header is normally set
to the value contained
in the P-Asserted-Identity header field to convey to the receiver the
identity of the original
inviting sender.
However the P-Asserted header field currently allows two URI values and
may be expanded in the future to carry more than two values as described
in :
http://tools.ietf.org/id/draft-ietf-sipping-update-pai-09.txt
cheers
Sal
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