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style=3D"width: 276.0px; margin: 0.0px 1.0px 0.0px 1.0px; border-style: =
solid; border-width: 1.0px 1.0px 1.0px 1.0px; border-color: #808080 =
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size=3D"4"><SPAN class=3D"Apple-style-span" style=3D"font-size: =
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style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
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href=3D"http://www.ietf.org/internet-drafts/draft-lee-sip-dns-sd-uri-00.tx=
t"><FONT class=3D"Apple-style-span" face=3D"Times" size=3D"4"><SPAN =
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face=3D"Times" size=3D"4"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 16px;">Mayumi Munakata</SPAN></FONT></DIV></TD><TD =
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border-color: #808080 #808080 #808080 #808080; padding: 0.0px 4.0px =
0.0px 4.0px"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><FONT class=3D"Apple-style-span" =
face=3D"Times" size=3D"4"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 16px;">Clarification of =
Privacy</SPAN></FONT></DIV></TD><TD valign=3D"middle" style=3D"width: =
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style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
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href=3D"http://www.ietf.org/internet-drafts/draft-munakata-sip-privacyz
	for [email-masked]; Tue, 06 Mar 2007 15:25:29 -0500
Date: Tue, 6 Mar 2007 20:25:26 +0000 (GMT)
From: Kapil Nayar <[email-masked]>
To: [email-masked]
Subject: [Sip] Can a UA initiate a late offer (in UPDATE instead of INVITE)

Consider UA-1 initiating an INVITE without SDP offer
(with 100Rel in the supported header). UA-1 expects
the remote end UA-2 to support 100Rel but also at the
same time doesn't want to offend endpoints which donot
support the same. Now, if UA-2 did not support 100Rel
and sends 180-Ringing without offer/ RSeq header. 

Can UA-1 at this point decide to initiate an offer in
an UPDATE - I didn't find any text in RFC 3261/ 3311
which specifically restricts this behavior? In
essence, can an UPDATE be sent with SDP-offer if the
initial INVITE didnot contain an offer, but at the
same time the callee didnot send an offer in either
reliable provisional response or UPDATE or PRACK? This
seemingly is some sort of "late offer initiation".

Although it seems the RFC doesnot specifically
restrict this behavior, it should be disallowed to
prevent any collision between the offer in UPDATE from
UA-1 and 200-OK/ UPDATE from UA-2.

thanks,

Kapil Nayar

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