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<DIV><FONT face=Arial>Bob,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>To prevent the HTML mail headaches, I will comment by item
number.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>0) Yes, I believe that DNS may be used to locate
the "host" and an LRQ then sent to port "port" of "host". "host" will
resolve the address and return an LCF. The user is not necessarily
registered with the GK. Actually, the LRQ might even be forwarded
(available in v4) and the GK to which the user is actually registered may
reply. Now, that does not mean that the endpoint has to perform the
DNS query and resolve the address-- it may pass it to the GK for
resolution. The Gatekeeper might also pass it to a border element for
resolution, since Annex G can send templates around with domain names in them
indicating the domains it can resolve. So, I think there are two possible
resolution mechanisms available to a Gatekeeper. I believe what I meant to
say I was going to remove is the statement in parentheses about the LRQ message
being used. Essentially, we're left with just saying that the default
protocol is "ras", which means that a GK should resolve the address.
However, mentioned separately.. somewhere.. that I think it might be reasonable
to specify the resolution "mode" rather than the protocol: "direct" (i.e., one
sends a setup to the address) or "indirect" (i.e., RAS must be used by the
endpoint and the GK may use RAS or Annex G, a database, a carrier pigeon,
etc.)</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>1) I did not make my point very clear at all-- I
apologize. What I was trying to say is that users enter aliases, not IP
addresses. Today, most H.323 users enter telephone numbers or some type of
alias and not the IP address of the called endpoint. I unsuccessfully
tried to draw a parallel between alias vs IP and user vs host. In my
opinion, the most common forms of the URL will be either "h323:user@host" or
"h323:user". The former will be the most popular, by far. The latter
will be more widely used inside corporate networks. We see this today with
popular e-mail programs, etc. Some companies are so large that multiple
domains are necessary, so it doesn't work well. However, most companies
keep all e-mail address for the company under one domain. So, "h323:user"
would be very likely in many corporate environments. I prefer to allow
these two syntaxes as I believe they are most common. I do not want
"h323:paulej@"-- that I just don't like.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Paul</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Robert.Callaghan@icn.siemens.com
href="mailto:Robert.Callaghan@icn.siemens.com">Callaghan, Robert</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=paulej@packetizer.com
href="mailto:paulej@packetizer.com">'Paul E. Jones'</A> ; <A
title=orit@radvision.com href="mailto:orit@radvision.com">Orit Levin</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A
title=ITU-SG16@mailbag.cps.intel.com
href="mailto:ITU-SG16@mailbag.cps.intel.com">Mailing list for parties
associated with ITU-T Study Group 16 (E-mail)</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, September 05, 2000 10:54
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Re: H.323 URL Specification
(second try)</DIV>
<DIV><FONT face=Arial></FONT><FONT face=Arial></FONT><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Paul,<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
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size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">See
below.<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Bob<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><!--[if supportFields]><span class=EmailStyle18><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span style='mso-element:field-begin'></span><span
style="mso-spacerun: yes"> </span>AUTOTEXTLIST \s "E-mail Signature" <span
style='mso-element:field-separator'></span></span></font></span><![endif]--><FONT
color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt">------------------------------------------------------------------</SPAN></FONT><FONT
color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Cló Gaelach (Twomey)" color=green size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: green; FONT-FAMILY: 'Cló Gaelach \(Twomey\)'">Robert
Callaghan<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt">Siemens
Enterprise Networks</SPAN></FONT><FONT color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt">Tel:
+1.561.923.1756<SPAN
style="mso-tab-count: 1">
</SPAN>Fax: +1.561.923.1403</SPAN></FONT><FONT color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt">Email:<SPAN
style="mso-tab-count: 1"> </SPAN><A
href="mailto:Robert.Callaghan@ICN.Siemens.com">Robert.Callaghan@ICN.Siemens.com</A></SPAN></FONT><FONT
color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt">------------------------------------------------------------------</SPAN></FONT><FONT
color=navy size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: navy; mso-bidi-font-size: 12.0pt; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><!--[if supportFields]><span class=EmailStyle18><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span style='mso-element:field-end'></span></span></font></span><![endif]--><SPAN
class=EmailStyle18><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<P class=MsoNormal
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; MARGIN-LEFT: 1.5in; BORDER-LEFT: medium none; PADDING-TOP: 0in; BORDER-BOTTOM: medium none; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-border-left-alt: solid black 1.5pt; mso-padding-alt: 0in 0in 0in 4.0pt"><FONT
face="Times New Roman" color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy">(0) The use of url means the "address
resolution" is done (by the local GK) using the DNS, not RAS! This is why the
"user only" url of H.323, is really an exceptional case. It is a question, if
we want to keep it within the url. It lets the local (source) GK
know, that the "address resolution" procedure should performed by other,
then DNS, means. The "protocol" means: the signaling H.323 protocol to contact
the (next hop towards the) destination, after the IP
address had been resolved.</SPAN></FONT><FONT color=navy><SPAN
style="COLOR: navy; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 39.75pt"><FONT face="Times New Roman"
color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black"> </SPAN></FONT><FONT
color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN-LEFT: 1.25in; TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo2; tab-stops: list 1.25in"><![if !supportLists]><FONT
face=Arial color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Arial; mso-color-alt: windowtext">(0)<FONT
face="Times New Roman" size=1><SPAN
style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></FONT><![endif]><FONT face=Arial color=black><SPAN
style="COLOR: black; FONT-FAMILY: Arial">I will remove the reference to RAS
and expect to see an explicit description of the procedure in Annex O.
What I would expect is that the <EM><I>hostport</I></EM> part will
resolve to a GK to which LRQ messages are directed.</SPAN></FONT><FONT
face=Arial color=black><SPAN
style="COLOR: black; FONT-FAMILY: Arial; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy"><![if !supportEmptyParas]><![endif]> </SPAN></FONT><FONT
color=navy><SPAN
style="COLOR: navy; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black"> </SPAN></FONT><FONT
color=navy><SPAN style="COLOR: navy">[RWC] Now I am confused.<SPAN
style="mso-spacerun: yes"> </SPAN>I thought that DNS was used to locate
the resolution server.<SPAN style="mso-spacerun: yes"> </SPAN>Then
LRQ(RAS) was used to communicate with that server to resolve the address of
the user.<SPAN style="mso-spacerun: yes"> </SPAN>The server doing the
address resolution may not be involved in the final
connections.</SPAN></FONT><FONT color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><SPAN class=EmailStyle18><FONT face=Arial color=navy
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 1in"><FONT face=Arial color=black
size=3><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Arial">(1) I
disagree that it is the exception. I would contend that calling a
specific machine would be the exception. Sure, one can call and endpoint
directly, but that's not typical. It is in testing and development
environments, but in production environments, users enter telephone
numbers. Also, I can imagine intranets where the h323 URL might be
used. At work, I might post a page with "h323:paulej", but I would never
post "h323:@cisco.com". However, the latter is allowed, of course.
What I <EM><I>do not</I></EM> want is "h323:paulej@" on a web page.
That's ugly, in my opinion. I realize that the SIP folks chose that, but
it seems illogical to me.</SPAN></FONT><FONT color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=navy size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy"><![if !supportEmptyParas]><![endif]> </SPAN></FONT><FONT
color=navy><SPAN
style="COLOR: navy; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><SPAN class=EmailStyle18><FONT
face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">[RWC]
I do not see any relationship between an URL and a telephone number. <SPAN
style="mso-spacerun: yes"> </SPAN>If a user enters a telephone number the
connection should be established using either the dialedDigits alias or the
partyNumber alias not the URL-id alias.<SPAN style="mso-spacerun: yes">
</SPAN>For me, the URL user should be a name type structure like in email
users.<SPAN style="mso-spacerun: yes"> </SPAN>This allows for a number
as a name but not as a telephone number.<SPAN style="mso-spacerun: yes">
</SPAN>I do not accept the SIP and ENUM concept where telephone numbers are
funny names with a default domain for DNS. <SPAN
style="mso-spacerun: yes"> </SPAN>In fact, I think that this will not
work due to difficulties with administration ownership of telephone
numbers.<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><SPAN class=EmailStyle18><FONT
face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><SPAN class=EmailStyle18><FONT
face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">[RWC]<SPAN
style="mso-spacerun: yes"> </SPAN>I do agree that user only will be an
exception because it forces the use of a default domain for DNS.<SPAN
style="mso-spacerun: yes"> </SPAN>It is not likely that there will be
universal default domain.<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black"> </SPAN></FONT><FONT
color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 1in"><FONT face=Arial color=black
size=3><SPAN style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: Arial">(2) If
I provided "h323:@192.168.1.1;proto=q931", a device should assume that it can
reach it on the default 1720 port or the default Annex E port (as described in
Annex E). If, however, I use a different port like
"h323:@192.168.1.1:2500;proto=q931", I would say that Annex E is out of the
picture. That is another reason why I believe the first step to
resolution should be through a Gatekeeper. The gatekeeper can not only
resolve the address, but also indicate any non-standard ports, including both
the TCP and Annex E transport information.</SPAN></FONT><FONT
color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=black size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: black"> </SPAN></FONT><FONT
color=black><SPAN
style="COLOR: black; mso-color-alt: windowtext"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><SPAN class=EmailStyle18><FONT
face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">[RWC]
In this case the endpoint that wished to use Annex E must support the
requirement of Annex E that requires the ability to fall back to
TCP.<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><SPAN class=EmailStyle18><FONT
face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
color=black size=3><SPAN style="FONT-SIZE: 12pt; COLOR: black"><![if !supportEmptyParas]><![endif]> </SPAN></FONT><FONT
color=black><SPAN
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