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@radvision.com -----Original Message----- From: Michael Welser michael.welser@AON.AT To: ITU-SG16@MAILBAG.INTEL.COM ITU-SG16@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 = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")" / "&" / "=" / "+" / "$" / "," escaped = "%" HEXDIG HEXDIGThis introduces IPv6 adresses according to RFCs 2732, 2373 and 2396. The ABNF still relies on RFC 2234.
It also corrects the IPv4 address by limiting each segment to three digits.
I am not too sure about the 'port'. Although 1*DIGIT makes absolutely sense, most schemes currently in use are more relaxed about it and just do a DIGIT.
I am also not too sure about the extended user definition and the password extension which are used e.g. in SIP and HTTP:
H323-URL = "H323:" userinfo [ "@" hostport ] userinfo = user [ ":" password ] user = *( unreserved / escaped / "&" / "=" / "+" / "$" / "," ) password = *( unreserved | escaped / "&" / "=" / "+" / "$" / "," )etc.
Could we need that?
Cheers,
Michael (welser@acm.org)
-----Original Message----- From: Mailing list for parties associated with ITU-T Study Group 16 [mailto:ITU-SG16@mailbag.cps.intel.com]On Behalf Of Paul E. Jones Sent: Monday, June 26, 2000 12:23 PM To: ITU-SG16@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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