H.323 URL

Orit Levin orit at radvision.com
Fri Jun 30 15:43:49 EDT 2000


Hi Paul and all the others!
This is my attempt to articulate the H323-URL motivation and use in the
shortest way.
I don't have any problem with expanding or/and tightening the definition of
the H.323 URL.
I think we should incorporate the real syntax corrections now.
Nevertheless, I would prefer to decide a BASIC H323-URL in a way which makes
it possible for later backwards compatible modifications.
I addition to that, I think that comments (4) and (5) from TD-40a should
appear in the decided document.
Regards,
Orit Levin
RADVision Inc.
575 Corporate Drive Suite 420
Mahwah, NJ 07430
Tel: 1 201 529 4300  (230)
Fax: 1 201 529 3516
www.radvision.com
orit at radvision.com
-----Original Message-----
From: Michael Welser <michael.welser at AON.AT>
To: ITU-SG16 at MAILBAG.INTEL.COM <ITU-SG16 at MAILBAG.INTEL.COM>
Date: Friday, June 30, 2000 5:43 AM
Subject: Re: H.323 URL Text


>I propose to change the ABNF to the following:
>
>      H323-URL      = "H323:" user [ "@" hostport ]
>      user          = 1*( unreserved / escaped )
>      hostport      = host [":" port]
>      host          = hostname / IPv4address / IPv6reference
>      hostname      = *( domainlabel "." ) toplabel [ "." ]
>      domainlabel   = alphanum / alphanum *( alphanum / "-" ) alphanum
>      toplabel      = ALPHA / ALPHA *( alphanum / "-" ) alphanum
>      IPv6reference = "[" IPv6address "]"
>      IPv6address   = hexpart [ ":" IPv4address ]
>      IPv4address   = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
>      IPv6prefix    = hexpart "/" 1*2DIGIT
>      hexpart       = hexseq | hexseq "::" [ hexseq ] | "::" [ hexseq ]
>      hexseq        = hex4 *( ":" hex4)
>      hex4          = 1*4HEXDIG
>      port          = 1*DIGIT
>      unreserved    = alphanum / mark
>      alphanum      = ALPHA / DIGIT
>      mark          = "-" / "_" / "." / "!" / "~" / "*" / "'"
>                    / "(" / ")" / "&" / "=" / "+" / "$" / ","
>      escaped       = "%" HEXDIG HEXDIG
>
>This introduces IPv6 adresses according to RFCs 2732, 2373 and 2396. The
>ABNF still relies on RFC 2234.
>
>It also corrects the IPv4 address by limiting each segment to three
>digits.
>
>I am not too sure about the 'port'. Although 1*DIGIT makes absolutely
>sense, most schemes currently in use are more relaxed about it and just
>do a DIGIT.
>
>I am also not too sure about the extended user definition and the
>password extension which are used e.g. in SIP and HTTP:
>
>      H323-URL      = "H323:" userinfo [ "@" hostport ]
>      userinfo      = user [ ":" password ]
>      user          = *( unreserved / escaped
>                    / "&" / "=" / "+" / "$" / "," )
>      password      = *( unreserved | escaped
>                    / "&" / "=" / "+" / "$" / "," )
>   etc.
>
>Could we need that?
>
>Cheers,
>
>Michael
>(welser at acm.org)
>
>> -----Original Message-----
>> From: Mailing list for parties associated with ITU-T Study Group 16
>> [mailto:ITU-SG16 at mailbag.cps.intel.com]On Behalf Of Paul E. Jones
>> Sent: Monday, June 26, 2000 12:23 PM
>> To: ITU-SG16 at mailbag.cps.intel.com
>> Subject: H.323 URL Text
>>
>>
>> Folks,
>>
>> I have attached the text that I propose adding to the H.323v4 document
>> relating to the H.323 URL scheme.  I think this text is weak,
>> but I expect
>> contributions to be brought to define the usage of this
>> scheme-- presently,
>> there really is no procedural text.
>>
>> I'd like to point out that I removed the telephone number
>> portions of the
>> URL, which should make both Orit and Bob happy :-)
>>
>> Please review the text and the ABNF grammar for errors.  You
>> will note one
>> small bit of procedural text near the end where it discusses
>> the fact that a
>> Gatekeeper may modify the alias provided to the Gatekeeper.
>> The substance
>> of that existed in TD-50 (Osaka) and I thought that it was
>> important to go
>> ahead and include that at the very least.
>>
>> Please, give me feedback.  Mr. Bowen and I plan to post H.323v4 and
>> H.225.0v4 this week for review.  A formal announcement will
>> be made later
>> today or tomorrow.
>>
>> Best Regards,
>> Paul
>>
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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