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T.38 potentially broken by recent Corrigendum
by Paul E. Jones 03 Mar '03

03 Mar '03

Folks, I just recently discovered that the ITU-T published a corrigendum to T.38 (1998) that apparently breaks backward compatibility for all T.38 devices currently deployed that follow the original 1998 specifications. The particular document in question is Corrigendum 1, which was approved in 2000 and subsequently published in May 2001. You can download the corrigendum document for free from this site: http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-… The issue at hand is a change in the ASN.1 syntax found in Annex A/T.38. The particular data structure is shown here: Data-Field ::= SEQUENCE OF SEQUENCE { field-type ENUMERATED { hdlc-data, hdlc-sig-end, hdlc-fcs-OK, hdlc-fcs-BAD, hdlc-fcs-OK-sig-end, hdlc-fcs-BAD-sig-end, t4-non-ecm-data, t4-non-ecm-sig-end, ... }, field-data OCTET STRING (SIZE(1..65535)) OPTIONAL } The syntactical change was the addition of an ellipsis at the end of the ENUMERATED "field-type". In the published 1998 specification, this ellipsis did not exist. What I would like to know is whether this change impacts your product or not. I am aware of many deployed devices on the market today that employs the 1998 syntax without this ellipsis. I would like to find out to what extent this change is going to present problems for companies represented on various lists and, if I get sufficient support, I want to take a contribution to the ITU-T SG16 meeting in May to try to resolve this problem in such a way as to not break backward compatibility and interoperability. I am looking forward to your replies. Kindest Regards, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com Paul E. Jones

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Reminder of Q.H/16 Accessibility Rapporteur Meeting. Cutoff date Feb. 26!!
by Gunnar Hellström 25 Feb '03

25 Feb '03

To Experts of ITU-T SG16 Question H: Accessibility to Multimedia Systems and services Cc Mr. P-A. Probst, Chairman of SG16 <probst-pa(a)bluewin.ch> Mr. M. Matsumoto, WP 1/16 Chairman <matsumoto(a)giti.waseda.ac.jp> Mr. S. Campos-Neto, ITU TSB <simao.campos(a)itu.int> >From G Hellstrom Rapporteur for Q.H/16 <gunnar.hellstrom(a)omnitor.se> ------------------------------------------------------------------- Subject: Reminder of Joint Rapporteur Meeting in Streatley, Berkshire, UK Date: March 18-19 2003 ------------------------------------------------------------------- Dear experts of ITU-T Question H/16. A Rapporteur meeting for ITU-T Q.H/16 Experts will be held in Streatley, Berkshire, UK on March 18-19. The meeting is co-located with a meeting of Q.11/16 in order to get an opportunity to discuss joint matters in the Text over IP area. The cutoff date for booking in the selected hotel, and announcement of your intention to participate is February 26, 18.00 GMT. Details of the meeting can be found in the attached document. Best regards ------------------------------------------- Gunnar Hellström Omnitor AB Renathvägen 2 SE 121 37 Johanneshov SWEDEN +46 8 556 002 03 Mob: +46 708 204 288 www.omnitor.se Gunnar.Hellstrom(a)Omnitor.se -------------------------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Text over IP existing standards- requirements - use cases - solutions
by Gunnar Hellström 21 Feb '03

21 Feb '03

Dear all, The discussion about solutions for text over IP is moving on. One goal for Q.H/16 is to have a requirement spec agreed from the rapporteurs meeting March 18-19 in UK. I have collected some material belonging to this work in www.totalconversation.org - An overview presentation over standards and solutions made for the ATIS seminar on Jan.13. - A small discussion presentation around the proposed requirement spec, a proposed division in use cases and one brief solution. - A draft requirement spec, intended to go as a contribution to the Q.H meeting. Please review the draft requirement spec, and comment directly to me or as contributions to the Q.H meeting. Please also remember to sign up for the announced Q.H/16 rapporteurs meeting not later than Feb. 26. I have noticed that it is good to have a list of already approved standards at hand when discussiong this topic. So: Already approved from standards groups of importance in the TVoIP discussion: -------------------------------------------------------------------------- - ITU-T F.700 Multimedia framework. Appendix 3, Defines media, among them Conversational text in two quality levels T1 and T2. T1 alows 1% errors. T2 allows 0.2 % error rate. - ITU-T F.703 Multimedia Conversation Service Description. Defines among other services Text Telephony and Total Conversation, and gives basic characteristics and requirements. This should be the starting point for the current work. - ITU-T V.18, an automoding text telephony standard including Baudot TTY. When it is specified "V.18 or any of its legacy submodes", it can be interpreted "Baudot TTY" in USA if you want. - ITU-T T.140, a presentation level text conversation protocol based on Unicode. Used in all multimedia environments to add a simple text dialogue to it. The natural choice for any effort to make TTY-like text conversations in other networks. - ITU-T H.323 Annex G Text Conversation and Text SET. Both the text telephone for H.323 VoIP networks, and the text component to add to H.323 Multimedia environment. - IETF RFC 2793, RTP Packetization for T.140. A description of how to pack T.140 text in packets for transmission with the RTP protocol, commonly used for media transmission in both H.323 and SIP multimedia and VoIP. Includes a standardised method for repeating information in sequential packets for increasing reliability. Includes also the MIME registration so that text/t140 can be started in a SIP textphone or multimedia phone. - ITU-T H.248.2 Text and Fax and call discrimination packages for the H.248 gateway protocol. Makes use of V.18, and other standards for discrimination between voice fax and and text telephony on PSTN lines, and has methods for establishing and transmitting text over the IP network with T.140 and RFC 2793. The application of V.18 principles in H.248.2 allows configuration to only support one or a few text telephone types ( e.g. Baudot and native V.18 ) H.248 is one of the dominating gateway architectures for VoIP. - 3GPP 26.235, 22.226, 23.226 reuses T.140 with RFC2793 in SIP connections with text in 3G wireless environments and gatewayes with H.248.2 to TTY and other textphones. - 3GPP 26.226 CTM describes a robust method to transport T.140 text over a voice channel, with possible conversion in both ends to other forms of text telephony, e.g. V.18 or Baudot TTY. Used in GSM wireless networks. These standards form a good base when now defining the application in ToIP. Regards Gunnar ------------------------------------------- Gunnar Hellström Omnitor AB Renathvägen 2 SE 121 37 Johanneshov SWEDEN +46 8 556 002 03 Mob: +46 708 204 288 www.omnitor.se Gunnar.Hellstrom(a)Omnitor.se -------------------------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Presence in LDAP
by Anatoli Levine 19 Feb '03

19 Feb '03

FYI -----Original Message----- From: Tyler Miller Johnson [mailto:trjohns1@email.unc.edu] Sent: Wednesday, February 19, 2003 11:37 AM To: h323forum Subject: [h323forum] Presence in LDAP Dear H323Forum User, I have been following the recent discussions about presence and instant messaging in H.323. I am the editor of a proposed new series of recommendations from ITU-T Study Group 16 on directory services architectures for multimedia conferencing. The architecture has been under review in SG16 for sometime, and we are hoping for ratification in May of this year if all goes well. The architecture is LDAP based and provides a way for users to be listed in directories in a standardized way, allowing searching of enterprise directories, and even searching of directory portals which can find users across the Internet. The architecture also supports the management of users through LDAP, rather than through closed databases associated with gatekeepers or SIP proxies. Early on it became evident that we could easily support presence through this architecture through the addition of a simple attribute. However, we chose not to add that because there already seemed to be confusion in the presence space with competing protocols. We did not want to cloud the issue. In some ways, the LDAP approach to presence is perhaps more scalable as it addresses security and large scale federation (i.e. inter-institutional) dynamics more directly. My question is, should SG16 re-visit this issue in regards to LDAP, or leave it out as it currently stands? Regards, Tyler Johnson Editor, H.LDAP --- You are currently subscribed to h323forum as: alevine(a)radvision.com To unsubscribe send a blank email to leave-h323forum-27275U(a)mail.imtc.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Re: Recommendations from the FS-VDSL Focus Group
by OKUBO Sakae 16 Feb '03

16 Feb '03

*** Forwarded to WP2/16 members. I have failed to take this up *** *** at the San Jose meeting - Sakae OKUBO (WP2/16 chairman) *** At 10:51 +0000 03/02/12, John Magill wrote: >Gentlemen, > >During your Rapporteur meetings this week, I would be grateful if >you would remind the WP2 delegates present of the new SG16 work on >Recommendations for Full Service VDSL. These are: >H.fsv-arch - Full Service VDSL - service architecture and CPE >H.fsv-oamp - Full Service VDSL - Operations, Administration, >Maintenance and Provisioning. >It is intended that these Recommendations will be proposed for >Consent at the May 2003 meeting of SG16, and they will be discussed >at the Focus Group meeting and potential Rapporteur meetings >(subject to interest) in Toronto 4-6 March. > >The latest drafts are available at the ftp site: >ftp://ftp3.itu.int/fsvdsl/ >For information on how to get access to the ftp site and subscribe >to the email reflector, see: >http://www.itu.int/ITU-T/studygroups/com16/fs-vdsl/edh-info.html > >The Associate Rapporteurs for this work are: >Associate Rapporteur for architecture Recommendation (Q.B) - Stephane >Py <stephane.py(a)rd.francetelecom.com> >Associate Rapporteur for OAM&P Recommendation (Q.C) - Peter Adams ><p.f.adams(a)btopenworld.com> > >Comments or questions on the drafts should be sent to the Associate >Rapporteurs, or to the reflector <fsvdsl-fg(a)itu.int>. > >I am also happy to take comments and general questions. > >Thanks for your help. I hope you are having a productive meeting. > >Best regards > >John > > > >----------------------------------------------------- >John Magill >Tel: +44 1666 510105 >Fax: +44 8700 527645 >Email: johnmagill(a)probecom.co.uk >----------------------------------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Outcome of the San Jose meeting
by OKUBO Sakae 15 Feb '03

15 Feb '03

Dear SG16 experts, The meeting reports of the just finished Q.D,F,G,2-5/16 meeting in San Jose are found at the following place: http://standard.pictel.com/ftp/avc-site/0302_San/TD-11.zip Q.F http://standard.pictel.com/ftp/avc-site/0302_San/TD-12a.zip Q.G http://standard.pictel.com/ftp/avc-site/0302_San/TD-13c.zip Q.2 http://standard.pictel.com/ftp/avc-site/0302_San/TD-14b.zip Q.3 http://standard.pictel.com/ftp/avc-site/0302_San/TD-15a.zip Q.4 -- Best regards, OKUBO Sakae e-mail: okubo(a)giti.waseda.ac.jp ******************************************************************* YRP Office Global Information and Telecommunication Institute (GITI) Waseda University YRP Ichibankan 312 Tel: +81 46 847 5406 3-4 Hikarinooka, Yokosuka-shi, Kanagawa-ken Fax: +81 46 847 5413 239-0847 Japan GITI Headquarter 29-7 Waseda University Bldg. Tel: +81 3 5286 3831 1-3-10 Nishi-Waseda, Shinjuku-ku, Tokyo Fax: +81 3 5286 3832 169-0051 Japan ******************************************************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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New ITU-T templates for documents
by OKUBO Sakae 13 Feb '03

13 Feb '03

---< Message from ITU-TSB >--- Dear all, As it was kindly pointed out to us, although you were informed about the existance of new templates (http://www.itu.int/ITU-T/studygroups/templates), there was no follow-up about their use. You may notice that the "Author's template" is just a plain table requesting to input certain information and later the text of the document. All documents (white, delayed, TDs) will be based on this same template. When they reach the TSB, a macro is applied in order to "transform" it into the appropriate type of document (only after this the ITU logo, headers, etc of the final published document will appear). This was implemented in order to avoid any changes that the document might have suffered when the TSB template was used. Please note that the aforementioned macro is *internal* to the TSB, they are not available to you, as many delegates expressed strong reservations against documents that have embedded macros. In a nutsheel, what is required of the authors is that you fill in (or fill out :-) the simple Winword table as provided in the template, and we will take care of the rest. Please, do not change its format (no more, no less rows or columns!). If you have any questions please feel free to contact me. Best regards Ms. Leslie Jones, Assistant ITU-T Study Group 16 International Telecommunication Union Place des Nations 1211 Geneva 20 Switzerland Tel: +41 22 730 5808 Fax: +41 22 730 5853 e-mail: leslie.jones(a)itu.int Study Group 16 e-mail: tsbsg16(a)itu.int ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Re: H323 for Instant Message and Presence information suppo rt?
by Ahmar Ghaffar 13 Feb '03

13 Feb '03

Markku, I gave some thought to this idea and i discussed this with Paul too a couple of months ago. My opinion is that Instant Messaging would be a bit too shall we say "heavy" on the H.323 protocol. Besides i think the scope of IM and SMS is quite different. Of course you can incorporate IM in H.323 but the question is, is this service really needed in H.323? What do you think? . The reason i took up SMS was that this service is already quite popular (also MMS now) and other signalling protocols are supporting somewhat similar services. If H.323 is to survive then it has to have a similar service. Another reason was that many vendors are supporting SMS in their own proprietary ways, so i thought why not define a standard which everybody can use. So in my opinion IM is not really so important from H.323 perspective. However i would give some serious thought to Presence Notification. Because this would be a really useful service. Maybe i can take this up when we are done with the SMS spec. :-) Regards Ahmar ----- Original Message ----- From: "Markku Korpi" <korpim(a)cosini.com> To: "Ahmar Ghaffar" <ghaffar(a)snom.de> Sent: Thursday, February 13, 2003 1:35 PM Subject: FW: H323 for Instant Message and Presence information suppo rt? > Ahmar, > > this email appeared on the ITU-T SG16 reflector just a couple of minutes > ago, after I sent out the previous email. > IM is diferent than SMS, of course, but what would it mean if we would > defiem IM over H.323 and use it also for SMS? > Could it be used for interworking with SMS, too? > > Markku > > -----Original Message----- > From: Mailing list for parties associated with ITU-T Study Group 16 > [mailto:ITU-SG16@echo.jf.INTEL.COM]On Behalf Of Anatoli Levine > Sent: Tuesday, February 11, 2003 8:50 AM > To: ITU-SG16(a)echo.jf.INTEL.COM > Subject: FW: [HvS] H323 for Instant Message and Presence information > suppo rt? > > > Interesting question - anyone wants to take a stub at it? > > Thanks, > Anatoli > > -----Original Message----- > From: Xiaotao Wu [mailto:xiaotaow@hotmail.com] > Sent: Tuesday, February 11, 2003 11:41 AM > To: Hvs(a)packetizer.com > Subject: [HvS] H323 for Instant Message and Presence information > support? > > > In the article "H.323 versus SIP: A Comparison", seems a very important > aspect of Internet Telephony prodcut (NOTE: not Telephony product) is missed > > -- how easily to integrate the H323 or SIP products with the other Internet > services? > > Is there any effort in H323 on supporting Instant Message and presence > information -- an important and convinient service over the Internet? > Or we have to say that any H323 terminal has to have a separate messenger > with it for IM and presence information, and any H323 proxy has to have a > separate presence agent with it. For SIP, with the effort in SIMPLE working > group, this can be easily solved, and it's easy to add a presence agent to a > > SIP proxy server. > > Thanks! > > _________________________________________________________________ > The new MSN 8: smart spam protection and 2 months FREE* > http://join.msn.com/?page=features/junkmail > > > _______________________________________________ > H.323-versus-SIP mailing list (hvs(a)packetizer.com) > http://host4.imagelinkusa.net/mailman/listinfo/hvs_packetizer.com > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > For help on this mail list, send "HELP ITU-SG16" in a message to > listserv(a)lists.intel.com > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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New ITU-T templates for documents
by Campos, Simao 13 Feb '03

13 Feb '03

Dear all, As it was kindly pointed out to us, although you were informed about the existance of new templates (http://www.itu.int/ITU-T/studygroups/templates), there was no follow-up about their use. You may notice that the "Author's template" is just a plain table requesting to input certain information and later the text of the document. All documents (white, delayed, TDs) will be based on this same template. When they reach the TSB, a macro is applied in order to "transform" it into the appropriate type of document (only after this the ITU logo, headers, etc of the final published document will appear). This was implemented in order to avoid any changes that the document might have suffered when the TSB template was used. Please note that the aforementioned macro is *internal* to the TSB, they are not available to you, as many delegates expressed strong reservations against documents that have embedded macros. In a nutsheel, what is required of the authors is that you fill in (or fill out :-) the simple Winword table as provided in the template, and we will take care of the rest. Please, do not change its format (no more, no less rows or columns!). If you have any questions please feel free to contact me. Best regards Ms. Leslie Jones, Assistant ITU-T Study Group 16 International Telecommunication Union Place des Nations 1211 Geneva 20 Switzerland Tel: +41 22 730 5808 Fax: +41 22 730 5853 e-mail: leslie.jones(a)itu.int Study Group 16 e-mail: tsbsg16(a)itu.int ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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Notice of Q.H/16 Accessibility Rapporteur Meeting
by Gunnar Hellström 12 Feb '03

12 Feb '03

To Experts of ITU-T SG16 Question H: Accessibility to Multimedia Systems and services Cc Mr. P-A. Probst, Chairman of SG16 <probst-pa(a)bluewin.ch> Mr. M. Matsumoto, WP 1/16 Chairman <matsumoto(a)giti.waseda.ac.jp> Mr. S. Campos-Neto, ITU TSB <simao.campos(a)itu.int> >From G Hellstrom Rapporteur for Q.H/16 <gunnar.hellstrom(a)omnitor.se> ------------------------------------------------------------------- Subject: Notice of Joint Rapporteur Meeting in Streatley, Berkshire, UK Date: March 18-19 2003 ------------------------------------------------------------------- Dear experts of ITU-T Question H/16. A Rapporteur meeting for ITU-T Q.H/16 Experts will be held in Streatley, Berkshire, UK on March 18-19. The meeting is co-located with a meeting of Q.11/16 in order to get an opportunity to discuss joint matters in the Text over IP area. Details of the meeting can be found in the attached document. Best regards ------------------------------------------- Gunnar Hellström Omnitor AB Renathvägen 2 SE 121 37 Johanneshov SWEDEN +46 8 556 002 03 Mob: +46 708 204 288 www.omnitor.se Gunnar.Hellstrom(a)Omnitor.se -------------------------------------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)lists.intel.com

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