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Section_8.3_rev to include point-to-multipoint VC connection configuration (root initiated join)
by Li Yan 14 Jan '98

14 Jan '98

Dear Mr. Okubo, Mr. Harasaki, and other Q.12/16 experts, Since the current Section_8.3 only covers the basic multipoint procedures for point-to-point VC connection configuration, I try to add more text in this section to include the point-to-multipoint case. Please review the attached Section_8.3_rev. There are still some information missing, I think, such as Information Elements tables for SETUP on point-to-multipoint call. Current Annex A describes Q.2971 multicast call setup and release procedures but does not have detailed information. Do we need to put more information on Annex A or to add some text in Section 6? Any thought? Li Yan **************************************************************** Lucent Technologies Phone: 732-957-3877 2E-433, 200 Laurel Ave., Fax: 732-957-5627 Middletown, NJ, 07733 E-amil:lyan@lucent.com U.S.A. ****************************************************************

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Clock synchonization of H.bmultipoint conference
by Hidenobu Harasaki 13 Jan '98

13 Jan '98

Dear Mr. Okubo and other Q.12/16 experts, This is a draft for the clock synchonization section. It is a contribution as one of Q.12 experts, not an editor. Although attached text is not yet complete, I would like to hear the comment/suggestion from other experts. {Assumption: I guessed that a highly stable 27MHz clock is only recoverable when a common network clock is available. The common network clock availability, however, seems to be impractical especially in customer premises ATM network environments, I would like to propose clock synchonization/adaptation shall be achieved solely in an H.bmultipoint MCU. } ------------------------------------------------------------------------ 7.5 Clock synchronization 7.5.1 General There are two independent clock sources need to be considered in H.bmultipoint conference: 1) 27MHz system time clock (STC) in each H.310 terminal and MP, 2) transmission clock for the multiplexed stream. Recommendation H.310 leaves STC synchronization as further study, current H.310 terminals may generate their STCs as follows: 1) by a local oscillator (local master), Note: In this case a frame synchronizer for video input or a video camara with clock reference input is necessary. 2) by referencing video input (video slave), 3) by referencing network clock (network slave), 4) by referencing recovered system_clock_frequency of the decoder (receiver slave). Transmission clock synchronization is also left as further study, the followings are possible to generate transmission clock in each terminal and MCU: 1) by referencing common network clock (common network clock), 2) by referencing receiver clock (local network clock), Note: Local ATM switch generates the network clock, not referencing public B-ISDN network clock. 3) by a local oscillator (local oscillator), 4) by referencing video input (video input). 7.5.2 STC generation in MP STC frequency in an MP shall conform to H.222.0 Section 2.4.2.1. PCR tolerance due to PCR modification during re-multiplexing in the MP shall conform to H.222.0 Section 2.4.2.2. Since there exists the case that STC frequency in each terminal is independent, MP shall adjust the difference. One possible implementaion is to equip a frame synchronizer for video and sample clock synchonizer for audio. MP may use a recovered STC of a selected peer as a re-multiplexing STC source, only if the stability of the recovered STC satisfies H.222.0 requirements. The ITU-T Timing Descriptor defined in H.222.1 will help the STC recovery process. When the recovered STC is used and video is switched, PCR discontinuity happens. Within a certain period of time after the PCR discontinuity, frame skip or repeat and/or audio discontinuity may occurs by the PCR clock recovery and AV synchronization processing. 7.5.3 Transmission clock synchronization Common network clock is not always available to all of the terminals. It is especially true in customer premises ATM networks. Thus, H.bmultipoint MCU and terminals shall operate under the environment that each terminal has its own transmission clock source. The receiver side of the MCU and each terminal shall recover the transmission clock by the method indicated through AAL paramter IE. {Source clock frequency recovery method IE only exists in AAL1? How can we inform the source clock frequency recovery method when we use AAL5?} ------------------------------------------------------------------------ > 4. Bit rate management > > We will need a sub-section in Section 7 which addresses how to manage > elementary stream and multiplexed stream bit rate, particularly in the > switched video environment. The description may not be normative, but > give some guidance to the implementors. Yes, I agree. FlowControlCommand can be used to limit the bit rate of video elementary stream. Is it apparent that a multiplexer will insert TS null packets to fill the transmission bit rate? I will try to describe some text tomorrow. Hideh Hidenobu Harasaki harasaki(a)ccm.CL.nec.co.jp Principal Researcher C&C Media Research Labs., NEC Corporation Phone: +81 44 856 8083 Fax: +81 44 856 2232

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Q13 related whites
by Sakae Okubo 12 Jan '98

12 Jan '98

Dear SG16 colleagues, Dale Skran> I have just place zipped versions of all Q13 whites in Dale Skran> word 6.0 format in the incoming directory. Thank you Dale for your efforts, I have placed all of them at: ftp://itu-t:sg15!avc@ftp.gctech.co.jp/9801_Gen/ with file names like H2250v2w_6.zip. I have found that all the white contributions up to COM 16-58 are now available at the ITU web site: http://www.itu.ch/itudoc/itu-t/com16/contr.html Files can be retrieved by TIES registered users. Editors are encouraged to see your documents because there may be some editorial changes from our submission during the process of publication. Best regards, Sakae OKUBO (Mr.) ******************************************************************** Graphics Communication Laboratories Phone: +81 3 5351 0181 6F ANNEX TOSHIN BLDG. Fax: +81 3 5351 0184 4-36-19 Yoyogi, Shibuya-ku, Tokyo e-mail: okubo(a)gctech.co.jp 151 Japan ********************************************************************

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WP2/16 meeting plan by Mr. Tosco
by Sakae Okubo 11 Jan '98

11 Jan '98

Dear SG16 colleagues, Attached please find the update of WP2/16 meeting plan provided by Mr. Tosco. Its Word version is available at: ftp://itu-t:sg15!avc@ftp.gctech.co.jp/9801_Gen/wp2_sche.doc Best regards, Sakae OKUBO (Mr.) ******************************************************************** Graphics Communication Laboratories Phone: +81 3 5351 0181 6F ANNEX TOSHIN BLDG. Fax: +81 3 5351 0184 4-36-19 Yoyogi, Shibuya-ku, Tokyo e-mail: okubo(a)gctech.co.jp 151 Japan ******************************************************************** DRAFT MEETING SCHEDULE FOR THE WP2/16 MEETING Date AM Schedule PM Schedule Mon 26 SG16 Plenary WP2 Plenary Tue 27 Q3, Q11, Q12, Q13 SG16 Plenary Wed 28 Q1, Q11, Q12, Q13 Q3, Q11, Q12, Q13 Thu Q3, Q11, (Q12,13,14)#1 Q3, Q11, |(Q3,12,13.14) 29* (Q12,13,14)#1 |#3 Fri Joint WP1, 2, 3 Q1, Q11 (Q3,12,13,14)#2 30* Mon 2* Q1, Q3, Q1, Q3, |Q1, Q3, Q13 (Q11,12,13,14)#5 (Q11,12,13,14,15)#|(Q11,15)#6 4 Tue 3 Q1, Q11, Q12, Q14 Q1, Q2, Q13 Wed 4 WP2 Plenary WP2 Plenary Thu 5 - SG16 Plenary Fri 6 SG16 Plenary SG16 Plenary Notes: *Thu 29, Fri 30 and Mon 2 have split AM or PM Schedules. (Qxx, Qyy) - Questions in parentheses meet in joint session. #1- H.235V2, H.MediaMIB, T.130/H.AVC #2- T.120 series Audio[Video requirements #3- T.120 security #4- Discussion of future directions, last 1/4 day in the afternoon #5- Conference control, H-245V4, H.246 addition and other common protocols #6- Future direction of advance video as it relates to H.324L

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Real-Time fax documents
by Dale L. Skran 11 Jan '98

11 Jan '98

I have just put in the Incoming directory of the GCL site the following: 1)TF21.doc - this is a set of comments sourced by me on the SG8 Real-time fax document. It will be discussed at the SG8 Q4 experts meeting next week. Comments welcome. 2)T.fax2R12.doc - this is the current (determined) draft of T.ifax2 that will be discussed and against with the comments of TF21.doc were made. Sourced Rapporteur SG8 Q4 H. Silbiger. It is my hope to determine a real-time fax annex to H.323 at the January meeting. TF21.doc contains an initial draft of this annex, which is not very long, but which may contain controversial passages. Email sent soon will have the greatest impact. Please cc the whole list. Dale Skran Rapporteur SG16 WP WP2 Q13

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Re: H.323 delta doc
by Bruce Allen 11 Jan '98

11 Jan '98

DUh. I forgot to attach it! -----Original Message----- From: Gary A. Thom [SMTP:gthom@DELTA-INFO.COM] Sent: Friday, January 09, 1998 6:01 PM To: ITU-SG16(a)mailbag.jf.intel.com Subject: H.323 delta doc Hi all, Attached is the Delta document for H.323. I did not include any changes for nonStandard or Fast Start as I did not hear a widely accepted proposal. If I missed anyones comments, please let me know. Gary ------------------------------------------------------ Name : Gary A. Thom Company: Delta Information Systems, Inc. Address: 300 Welsh Rd., Bldg 3 Horsham, PA 19044 USA Phone : +1-215-657-5270 Fax : +1-215-657-5273 E-mail : gthom(a)delta-info.com ------------------------------------------------------ << File: H323DL.DOC >>

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H.323 delta doc
by Gary A. Thom 09 Jan '98

09 Jan '98

Hi all, Attached is the Delta document for H.323. I did not include any changes for nonStandard or Fast Start as I did not hear a widely accepted proposal. If I missed anyones comments, please let me know. Gary ------------------------------------------------------ Name : Gary A. Thom Company: Delta Information Systems, Inc. Address: 300 Welsh Rd., Bldg 3 Horsham, PA 19044 USA Phone : +1-215-657-5270 Fax : +1-215-657-5273 E-mail : gthom(a)delta-info.com ------------------------------------------------------

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Changes to the H.450.1 and H.450.2 white drafts
by Korpi Markku PN VS LP3 09 Jan '98

09 Jan '98

Greetings, Attached is a delta document describing the the changes to the H.450.1 and H.450.2 white drafts to address the issues discussed on the reflector. There are currently no changes to H.450.3. The intent is for this change document and the final documents to be submitted next week for distribution to the SG16 meeting. Please let me know if I've missed anything. Best Regards, Markku ---------------------------- Markku Korpi korpim(a)scn.de Siemens Private Communication Networks Tel +49 89 722 34570 Mobile +49 171 3345338 Fax +49 89 722 39335

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Phase transition in H.310 and H.324
by Sakae Okubo 09 Jan '98

09 Jan '98

Dear SG16 colleagues, Attached please find my correspondence with Seung ho SHIN, Korean Telecom, regarding the phase change from A4 (logical channels setup) to B (audiovisual communication) in H.310 terminals. The same discussion will apply to the phase change from D (initialization) to E (communication) in H.324 terminals. I hope my understanding in the reply is correct. Best regards, Sakae OKUBO (Mr.) ******************************************************************** Graphics Communication Laboratories Phone: +81 3 5351 0181 6F ANNEX TOSHIN BLDG. Fax: +81 3 5351 0184 4-36-19 Yoyogi, Shibuya-ku, Tokyo e-mail: okubo(a)gctech.co.jp 151 Japan ******************************************************************** Dear Seung ho SHIN, >In phase A4(logical channels setup), which is one of H.310 call phases >for native H.310 communication, H.310 terminal establishes multiple >logical channels. After completing logical channels setup, H.310 >terminal transit from phase A4 to phase B. The out-going terminal can >know the instant that H.245 completes multiple logical channels setup. >But the in-coming terminal can't know it. > >The in-coming terminal can't know how many the out-going terminal >attempts to setup logical channels. Therefore, the in-coming terminal >doesn't know when it transits from phase A4 to phase B. > >How can I solve this problem? Communication phases set out in Section 7 of H.310 are to describe the communication steps from the start to the end of an H.310 call, not necessarily to specify state machines of the terminal. In case of moving from phase A4 (logical channels setup) to Phase B (audiovisual communication), there is no clear state transition of the terminal as a whole. As soon as a logical channel is in the ESTABLISHED state, its corresponding media content (either of audio, video, data, or video frame synchronous signalling) can be transmitted, thus communication can start. Transmission of multiple media contents can be synchronous, or can be audio first and video later, or can be left as they start according to the terminal design. Data, in particular, may usually start some time after audio and video communications have started. Therefore even in the transmitting side, transition from phase A4 to phase B differs from one logical channel to another. Identification of phase transition at the receiving side similarly depends on each logical channel. Please note, however, that H.245 defines state machines for their signalling entities to assure their operation. I hope this information would help your resuming H.310 terminal implementation. END

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T.120/H.323 Harmonization Changes
by Pat Galvin 08 Jan '98

08 Jan '98

Hi everyone, Alas, someone has found a problem with the proposal that was posted on Tuesday. The problem is as follows: When communicating through a "pass-through" Gateway to an H.320 endpoint, it is possible for the H.320 endpoint to issue an unsolicited Query at any time. Normally this won't happen after a T.120 connection has been established. But it can happen during the establishment of the T.120 connection. So, if the H.323 endpoint initiates an OLC, and is told by the Gateway to issue a Query, it is possible that the H.320 endpoint will also issue a Query before the T.120 connection is actually established. In this case, the Gateway MUST know the address of the H.323 endpoint (in order to forward the Query), even though it has already told that endpoint to place the call. This illustrates a case where one endpoint needs the address of the other for unpredictable reasons. The easiest way to ensure that endpoints will always have the addresses they need is to mandate that BOTH endpoints shall ALWAYS include their transport address in the OLC exchange (in both the OLC and the OLC Ack), and that those transport addresses will remain valid for the duration of the logical channel. The point of these proposals is to increase the flexibility of the OLC procedures to handle even the most complex cases. But there has been some concern that there is not enough guidance on how to handle the simple cases. To this end, a new sentence has been added stating that if neither one of the endpoints has a preference on setting up the T.120 call, then the call will follow the direction of the H.323 call. Endpoints that need to do something different can override this default behavior on an as-needed basis. The suggested changes to Tuesday's proposal are as follows: CHANGE #1: The following sentences: If the initiator is the slave, it shall include a transport address in the openLogicalChannel message. If the initiator is the master, it may decide whether or not to include a transport address in the openLogicalChannel message. In either case the peer endpoint may choose to ignore the transport address. will change to: The initiator shall include a transport address in the openLogicalChannel message. The peer endpoint may choose to ignore the transport address. CHANGE #2: The following sentences: In the openLogicalChannelAck, the responder shall include a transport address to be used for set-up of the T.120 connection if it expects the initiator to originate the T.120 call (this will always be the case if it did not receive a transport address from the initiator). Otherwise, the transport address shall be absent. In all cases, the transport address for the T.120 connection shall be carried in the separateStack parameter. will change to: In the openLogicalChannelAck, the responder shall include a transport address, even if it expects the initiator to originate the T.120 call. In all cases, the transport address shall be carried in the separateStack parameter, and shall remain valid for the duration of the logical channel. CHANGE #3: In the next two paragraphs, the text explains how the t120SetupProcedure is to be used. For each choice, in each paragraph, there is a sentence describing when to include a transport address. All of these sentences will be removed, since the transport address will always be included. CHANGE #4: In the paragraph on how the responder uses the t120SetupProcedure, the following sentence will be added: If neither endpoint has a preference, the T.120 call should be established in the same direction as the H.323 call. If these changes are OK with everyone, I will merge them into the document posted on Tuesday before providing it to the editors of H.323 and H.245. Thanks. ------------------------------------ Pat Galvin pgalvin(a)DataBeam.com Phone: +1-910-854-3551 Fax: +1-910-854-1983

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Comments on Seection_8_rev
by Li Yan 08 Jan '98

08 Jan '98

Dear Mr. Okubo, Mr Harasaki, and other Q.12/16 experts, Attached please find some comments regarding open logical channel and Section_8_rev.mw6. Best regards, Li Yan **************************************************************** Lucent Technologies Phone: 732-957-3877 2E-433, 200 Laurel Ave., Fax: 732-957-5627 Middletown, NJ, 07733 E-amil:lyan@lucent.com U.S.A. **************************************************************** 1. Open logical channels for the 1st terminal, 2nd terminal, etc. SO> One point I need your views is the way to open logical channels. In SO> Section 8.3.1 (first terminal added to the conference), the text SO> reads As follows: SO> "After establishment of the additional VC(s), the procedures of SO> H.245 shall be used to open the desired video, audio, data, and/or SO> control logical channels using logical channel signaling protocol SO> and bi-directional logical channel signaling protocol defined in SO> H.245." SO> In Sections 8.3.2 (second terminal added to the conference) and SO> 8.3.3 (third terminal added to the conference), however, it reads as SO> follows: SO> "An MCU shall open the desired video, audio, data, and/or control SO> logical channels using the logical channel signaling protocol and SO> bi-directional logical channel signaling protocol defined in H.245." SO> The difference is intentional? If uni-directional logical channel SO> Signaling is used, not only MCU but also the terminal should SO> establish the logical channel, otherwise we cannot have SO> bi-directional video transmission, for example. If all logical SO> channels are bi-directional, then there is a reason for MCU to open SO> them because it is the master. Note that H.310 strongly recommends SO> to use the bi-directional logical channel signaling if the media is SO> bi-directional. SO> The first description is applicable to all the cases, while the SO> second description may be more appropriate to the current multipoint SO> case. In the latter case, we need to add some language that the SO> logical channels should always be bi-directional. SO> Any thoughts? My original text was focus only on tightly coupled MCU ( VC connection configuration a)), where bi-directional logical channels are always used for all the terminals connected to MCU. Now, since we want the procedures to cover other connection configurations, such as in Figure 2, b), c), and d), your changes to use the first description to replace others are more proper. 2. Can we change the "under working" in 8.5.2, 8.6, and exceptional procedures to "For further study"?

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Missing references (in all H.323 standards)
by Orit Levin 08 Jan '98

08 Jan '98

Dear editors! We think that the following references should be added: In all of H.323 standards reference to X.680 Amendment 1 (Rules of Extensibility) In addition in H.450.1 reference to X.681 Amendment 1 (Rules of Extensibility) Orit Levin RADVision Inc. E Mail: orit(a)radvision.com 575 Corporate Dr., Suite 420 Tel: 201-529-4300 ext. 230 Mahwah, NJ 07430 Fax: 201-529-3516

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Fast start and call centres
by Pete Cordell 08 Jan '98

08 Jan '98

Jim (or anybody else), Please can you run through how fast start would work if H.323 was used to connect to a call centre which first played you a message saying something like "Thank you for your call. You are in a queue...", and then when an agent freed up, it connected you to the agent. Giving me an example might help me to understand better where you are coming from. Thanks, Pete ================================= Pete Cordell BT Labs E-Mail: pete.cordell(a)bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 =================================

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Re: corrections to H.225.0 V2
by Pete Cordell 08 Jan '98

08 Jan '98

Glen, One thing mentioned on the reflector was moving the CallIdentifier to the H323-UU-PDU part of the message rather than including it separately in each constituent part of the message. This moves it to the highest layer of commonality and also means that it is in the same place for all messages. This is important as the module that decides which call the message belongs to should not really have to know large amounts about the format of each message. Below should show the change I mean: H323-UU-PDU ::= SEQUENCE { h323-message-body CHOICE { setup Setup-UUIE, callProceeding CallProceeding-UUIE, connect Connect-UUIE, alerting Alerting-UUIE, userInformation UI-UUIE, releaseComplete ReleaseComplete-UUIE, facility Facility-UUIE, ..., progress Progress-UUIE, empty NULL -- used when a FACILITY message is sent, -- but the Facility-UUIE is not to be invoked -- (possible when transporting supplementary -- services messages) }, nonStandardData NonStandardParameter OPTIONAL, ..., h4501SupplementaryService SEQUENCE OF OCTET STRING OPTIONAL, -- each sequence of octet string is defined as one -- H4501SupplementaryService APDU as defined in -- Table 3/H.450.1 callIdentifier CallIdentifier } Regards, Pete ================================= Pete Cordell BT Labs E-Mail: pete.cordell(a)bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 ================================= >---------- >From: Glen Freundlich[SMTP:ggf@LUCENT.COM] >Sent: 07 January 1998 22:54 >To: ITU-SG16(a)MAILBAG.INTEL.COM >Subject: corrections to H.225.0 V2 > ><<File: h2250v2x.doc>> >Dear colleagues, > >Attached is a document describing changes to the H.225.0 V2 white draft >to address various issues I've seen through email. The intent is for >this change document to be submitted to the SG16 meeting. Please review >the document as soon as possible and let me know if I've missed >anything >or made some other error. I have not yet addressed issues regarding the >pointer to RFC2190 for H263. > >In addition, I've compiled the ASN.1 but would appreciate if someone >else could also compile it to be sure it is sane. > >Thank you, >Glen > > >-- >Glen Freundlich ggf(a)lucent.com >Lucent Technologies office: +1 303 538 2899 >11900 N. Pecos fax: +1 303 538 3907 >Westminster, Colorado 80234 USA > >

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Comments on H.bmultipoint
by Li Yan 08 Jan '98

08 Jan '98

Dear Mr. Okubo, Mr. Harasaki and other Q.12/16 experts, Attached please find some comments on the suggestions/changes proposed by Mr. Okubo and Mr.Haraski. Thanks, Li Yan **************************************************************** Lucent Technologies Phone: 732-957-3877 2E-433, 200 Laurel Ave., Fax: 732-957-5627 Middletown, NJ, 07733 E-amil:lyan@lucent.com U.S.A. **************************************************************** 1. Structure of Chapter 5 and Chapter 7 SO> I would suggest to leave in Chapter 5 the current 5.1 Various VC SO> connection configurations, explanations of "meet-me" and "dial-out" SO> and general configuration of MCU as described in 5.2 and illustrated SO> in Figure 3, but to move other materials (5.3 and subsequent SO> sub-sections) to Chapter 7 and merge them with the materials there. If SO> this idea is agreeable, the title of the current 5.2 should exclude SO> "characteristics" and the description should be without "shall". This is fine with me. 2. Figure 3 and functions of MC, MP, MR and network Interface SO> MC handles DSS2 call signaling and H.245 control signaling in AAL SO> or higher layers of each port to the terminal. In addition to them, MC SO> contains intelligence on top of DSS2 and H.245 handling to manage SO> multiple ports participating in a multipoint conference. This SO> intelligence corresponds to "Call Management" in Figure 2/H.310. The SO> "Call Control" in MC should more appropriately be named "Call SO> Management". This is just a possibility. Another possible implementation is that MC handles all H.245 related control and some of the DSS2 call control management (on top of DSS2) while network interface card handles DSS2 and below layer3 functions. SO> MP handles audio, video and data signals in AAL or higher layers. I thank so too. SO> MR handles ATM cells in the ATM layer? Or it handles signals above SO> ATM (between ATM and AAL)? Is this implementation dependent? HH>According to your and Mr. Okubo's comments, I have put revised Figure 3 HH> as hbmul3v2.ppt in incoming directory of ftp.gctech.co.jp.The PowerPoint HH> file Have two figures. One is single physical network interface HH> version, the other is virtual network interface per peer version like HH> H.231. HH> Which figure is better? HH> Should we need to include "call control" next to Network Interface? Either one is ok with me. But I don't want to exclude the possibility of implementing DSS2 call control in Network Interface. We could either include "call control" next to network Interface or put some text to explain it. 3. H.245 for multipoint and Video mixing in Section 8 I will get back to you tomorrow.

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None
by Jim Toga 08 Jan '98

08 Jan '98

Greetings, Attached is the editorial changes to the H.235 2 white draft. There are very few changes, and I believe that I have captured the typographical errors that I know about. Please let me know if I've missed anything. Best Regards, jimt. ************************************************************************* *** +1-503-264-8816(voice) +1-503-264-3485(fax) *** *** jtoga(a)ibeam.intel.com Intel - Hillsboro, OR. *** *** PGP keyID 36 07 86 49 7D 74 DF 57 50 CB BA 32 08 9C 7C 41*** *************************************************************************

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corrections to H.225.0 V2
by Glen Freundlich 07 Jan '98

07 Jan '98

Dear colleagues, Attached is a document describing changes to the H.225.0 V2 white draft to address various issues I've seen through email. The intent is for this change document to be submitted to the SG16 meeting. Please review the document as soon as possible and let me know if I've missed anything or made some other error. I have not yet addressed issues regarding the pointer to RFC2190 for H263. In addition, I've compiled the ASN.1 but would appreciate if someone else could also compile it to be sure it is sane. Thank you, Glen -- Glen Freundlich ggf(a)lucent.com Lucent Technologies office: +1 303 538 2899 11900 N. Pecos fax: +1 303 538 3907 Westminster, Colorado 80234 USA

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Video mixing in Section 8 of H.bmultipoint
by Sakae Okubo 07 Jan '98

07 Jan '98

Dear Ms. Li Yan and other Q.12/16 experts, I have attempted to cover both video switching and video mixing in Section 8 of H.bmultipoint as attached. Please review it. One point I need your views is the way to open logical channels. In Section 8.3.1 (first terminal added to the conference), the text reads as follows: "After establishment of the additional VC(s), the procedures of H.245 shall be used to open the desired video, audio, data, and/or control logical channels using logical channel signalling protocol and bi- directional logical channel signalling protocol defined in H.245." In Sections 8.3.2 (second terminal added to the conference) and 8.3.3 (third terminal added to the conference), however, it reads as follows: "An MCU shall open the desired video, audio, data, and/or control logical channels using the logical channel signalling protocol and bi- directional logical channel signalling protocol defined in H.245." The difference is intentional? If uni-directional logical channel signalling is used, not only MCU but also the terminal should establish the logical channel, otherwise we cannot have bi-directional video transmission, for example. If all logical channels are bi-directional, then there is a reason for MCU to open them because it is the master. Note that H.310 strongly recommends to use the bi-directional logical channel signalling if the media is bi-directional. The first description is applicable to all the cases, while the second description may be more appropriate to the current multipoint case. In the latter case, we need to add some language that the logical channels should always be bi-directional. Any thoughts? Best regards, Sakae OKUBO (Mr.) ******************************************************************** Graphics Communication Laboratories Phone: +81 3 5351 0181 6F ANNEX TOSHIN BLDG. Fax: +81 3 5351 0184 4-36-19 Yoyogi, Shibuya-ku, Tokyo e-mail: okubo(a)gctech.co.jp 151 Japan ******************************************************************** begin 666 Section_8_rev.mw6 MT,\1X*&Q&N$ .P # /[_"0 & ! M 0 $ @ $ #^____ #_____________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M_______________________]____)0 /[___\F !0 8 ' M" D * "P P - #@ \ 0 $0 !( 3 M % !4 6 %P !@ 9 &@ !L < '0 !X M ? 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1 0

Resend: T.120/H.323 Harmonization problems
by Pat Galvin 07 Jan '98

07 Jan '98

This is a re-transmission of an E-mail that I sent yesterday concerning problems with the T.120/H.323 harmonization changes. I understand that some people were not able to read the attachment from yesterday's mail. I have attached it unzipped and with a short file name this time (it's only 18K). If you got it OK the first time, then you can ignore this E-mail (it's identical). I strongly encourage anyone with an interest in this subject to review this material and report any issues or concerns by the end of the week. The delta documents must be submitted by Monday of next week. Below is the original E-mail. Thanks again. Pat Galvin pgalvin(a)DataBeam.com -----Original Message----- Recent conversations have exposed some problems with the T.120/H.323 harmonization changes that were made in Sunriver (mainly related to Gateway compatibility). Attached is a document that details the wording changes required to resolve these problems. We realize that it is very late in the process, but these are real issues and we'd like to get them resolved if at all possible. Gary Thom has indicated to me that if there is general agreement to these changes, they can be included in the change document being submitted as a Delayed contribution. The problems are as follows: 1. When communicating through a "smart" Gateway to an H.320 MCU, it is possible for the H.323 node to get a "waitForInvite" from the Gateway. However, the current text does not guarantee that the Gateway will have the transport address of the H.323 node. To fill this hole, the H.323 node MUST provide its transport address in the OLC if it is the slave (this will never happen if the node is the master). 2. When communicating through a "pass-through" Gateway to an H.320 node, it will sometimes be necessary for the Gateway to dictate how the call should be made. Therefore, the new text allows the responder to override the recommended setup procedure by ignoring the transport address in the OLC (and sending a transport address back in the OLC Ack). 3. The current t120SetupProcedure choices are not accurate. issueQueryAndJoin should really be just issueQuery (since it may be necessary to respond with something other than Join). issueCreate is not necessary, since conference creation is an implicit part of the OLC procedures. There is no need to differentiate between issueJoin and issueInvite, since master/slave determination indicates the required hierarchy. And finally, waitForInvite is only useful when the initiator is the slave. By using a more generic name, it could be useful regardless of who initiates the OLC (it can be interpreted as either wait for invite OR wait for join, depending on M/S). In summary, the suggested t120SetupProcedure choices are: originateCall; waitForCall; and issueQuery. For more details on the exact suggested changes, please review the attached document. Thank you for your consideration. ------------------------------------ Pat Galvin pgalvin(a)DataBeam.com Phone: +1-910-854-3551 Fax: +1-910-854-1983 begin 666 thrmchng.doc MT,\1X*&Q&N$`````````````````````/@`#`/[_"0`&```````````````! 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M````]R,```````#W(P```````/<C````````:R@```(```!M* ```````&TH M````````;2@``$<```"T* ``# $``, I```,`0``S"H``!X````;*P``6 `` M`',K```T````ZBH`````````````````````````````@",```````#W(P`` M````````#0`/``(``@#W(P```````/<C```````````````````````````` M`/<C````````]R,```````#J*@```````'$F````````@",```````" (P`` M`````/<C`````````````````````````````-HC```9````<28```````!Q M)@```````'$F````````]R,``'H"``" (P```````/<C````````@",````` M``#W(P```````&LH``````````````````!0543RUAJ]`90C```.````HB,` M`!@```" (P```````( C````````@",```````" (P```````/<C```````` M:R@```````!Q)@``^@$``'$F```````````````````````````````````` M```````````````````````````````````````````````````````````` M``````````````````````````!3=6=G97-T960@0VAA;F=E<R!T;R!(+C,R M,SH--BXR+C<)1&%T82!C:&%N;F5L( V%#51H92!T,3(P4V5T=7!0<F]C961U M<F4@8VAO:6-E(&]F('1H92!.971W;W)K06-C97-S4&%R86UE=&5R<R!S=')U M8W1U<F4@<VAO=6QD(&)E('-E="!T;R!I;F1I8V%T92!T;R!T:&4@8V%L;&5R M('=H:6-H($=#0R!P<FEM:71I=F5S('-H;W5L9"!B92!U<V5D('1O(&5S=&%B 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1 0

T.120/H.323 Harmonization problems
by Pat Galvin 06 Jan '98

06 Jan '98

Recent conversations have exposed some problems with the T.120/H.323 harmonization changes that were made in Sunriver (mainly related to Gateway compatibility). Attached is a document that details the wording changes required to resolve these problems. We realize that it is very late in the process, but these are real issues and we'd like to get them resolved if at all possible. Gary Thom has indicated to me that if there is general agreement to these changes, they can be included in the change document being submitted as a Delayed contribution. The problems are as follows: 1. When communicating through a "smart" Gateway to an H.320 MCU, it is possible for the H.323 node to get a "waitForInvite" from the Gateway. However, the current text does not guarantee that the Gateway will have the transport address of the H.323 node. To fill this hole, the H.323 node MUST provide its transport address in the OLC if it is the slave (this will never happen if the node is the master). 2. When communicating through a "pass-through" Gateway to an H.320 node, it will sometimes be necessary for the Gateway to dictate how the call should be made. Therefore, the new text allows the responder to override the recommended setup procedure by ignoring the transport address in the OLC (and sending a transport address back in the OLC Ack). 3. The current t120SetupProcedure choices are not accurate. issueQueryAndJoin should really be just issueQuery (since it may be necessary to respond with something other than Join). issueCreate is not necessary, since conference creation is an implicit part of the OLC procedures. There is no need to differentiate between issueJoin and issueInvite, since master/slave determination indicates the required hierarchy. And finally, waitForInvite is only useful when the initiator is the slave. By using a more generic name, it could be useful regardless of who initiates the OLC (it can be interpreted as either wait for invite OR wait for join, depending on M/S). In summary, the suggested t120SetupProcedure choices are: originateCall; waitForCall; and issueQuery. For more details on the exact suggested changes, please review the attached document. Thank you for your consideration. ------------------------------------ Pat Galvin pgalvin(a)DataBeam.com Phone: +1-910-854-3551 Fax: +1-910-854-1983 begin 666 thrmchng.zip M4$L#!!0````(`'MQ)B0(!?0ZNA$```!(```9````2&%R;6]N:7IA=&EO;B!# M:&%N9V5S+F1O8^U;"W =U7G^]]ZKQ[5U+0D_\ M8V^#(1ESTL(WM`+$L^2&P M)=F2:V#,,*M[5[IKW[M[O;O7L@R>,24TGK3IT&EFF@<=(!/BIFEX-"U#*63< M3C-ABMNXGAK2.LD`P36)2<<&!H+'6/W^<W;OW?N096J@):,C?SIGS^L_YS__ MZZS61W_2^.IC3\]]C4K2K12F"V-1J@[4*<"5_D,#T6RO[L+8V!A7S0+&)M-G M*OWL\11M?S4:X?/3`V>-XZ>U..!#UU-96CNSO*XL+20ZH!3R`XMD]<7R&<B? 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1 0

Re: Pete Cordell's FastStart issues
by Pete Cordell 05 Jan '98

05 Jan '98

Jim, Hope you had a good Christmas break... Comments below... Pete ================================= Pete Cordell BT Labs E-Mail: pete.cordell(a)bt-sys.bt.co.uk Tel: +44 1473 646436 Fax: +44 1473 645499 ================================= [SNIP] >>Firstly I'm worried about sending multiple call proceedings/alertings to >>an endpoint. Conceivably we could get the case that we receive a call >>proceeding after alerting for example. This is definitely not valid >>Q.931. > >Firstly I would like to see _anyone_ indicate that what we do in H.323 >is >valid Q.931..... >We certainly borrowed a bunch of message formats, and some of the >functionality, but I take my had off to anyone that has re-used an >unmolested Q.931 stack :-) Hopefully it should be Q.931 modified according to H.225. Hence, unless otherwise stated the order of messages should be as in Q.931. (As Mr. Interoperability you should probably shot somebody who has used an unmolested stack!!! However, a Q.931 stack is a good starting point.) > >[SNIP] >>We could say that any endpoint that accepts fastStart should be >>able to cope with this case, but this involves multiple modifications to >>the Q.931/H.225 state machine which I feel is undesirable. > >A number of development engineers I have spoken with say this is a >trivial >issue, but as I said above I don't think it is a problem. I guess it depends on your definition of trivial. I would say it wasn't difficult, but I certainly wouldn't say it was trivial. I guess it depends where you started from with your stack. > >>User >>invitation and media establishment are in many respects orthogonal and >>so making media negotiation conform to the invitation sequence is tying >>one arm behind your back. > >Hmmm... I'm not sure how you know what media to send (from caller to >callee) until an invitation has been accepted. The media from callee >back >to caller will have the same universe of choices no matter who the >callee is. Hence the phrase "...in many respects...". The media negotiation can decide which caller to callee media to use IF an invitation is eventually accepted. If the invitation is not accepted, then, in theory at least, an endpoint can be connected to some other node and a new media negotiation process initiated, the result of which can be accepted if the invitation is accepted. > >>What would be your comments if I suggested >>moving the fastCaps stuff to the H323-UU-PDU field? > >A couple of things. I assume you mean that you want to turn the two >field >definitions into complete messages themselves. One problem is that >this by >definition increases the roundtrip times (thereby taking the 'fast' out >of >FastStart...) due to the fact that for Q.931 there can only be one >message >for each RFC1006 packet. Another issue is that if they are separate >messages we run into complex and error prone issues with interactions >of >H.245. This would seem to be creating a 'new' H.245 within H.225.0 No, H323-UU-PDU is the way we pick up nonStandardData and H.450 PDUs. Except for the CHOICE members, anything in this SEQUENCE is common to all messages. Hence any message can make use of fields defined here. > >>This would allow us >>to send the messages at any time (via FACILITY if necessary) without >>affecting the Q.931 sequence and state. This should be OK as this is >>what is being used for supplementary services. > >I'm not entirely sure what you mean by this. Supplementary service >messages >are indeed piggybacked in Facility messages, but the two that are >currently >defined change both the media and call connection state. If you're >going >to use Faciltiy messages to pass FastCaps at some 'later' time in the >call >sequence, I don't see how this saves any time over simply using H.245. H.450 supplementary service messages can also ride in the SETUP message, and indeed any other message you care to put them in. As a note, none of the supplementary service message directly affect the media and call connection state, although messages that are issued as a result of processing the H.450 messages will likely affect the media and connection state. To use the current H.245 method to open media I have to exchange an H.245 address, do TCP sync, exchange caps, do MSD, and then OLC signalling. Hopefully any fast start scheme improves on that. > >> If this approach doesn't >>work then we have a major problem, so any issues with it need to be >>raised!!! >> >>I'm also thinking about how the gatekeeper will transfer the >>capabilities through itself. It will have to decode the messages (e.g. >>setup) so that it can find the relevant information. > >I assume the GK is doing some fancy footwork in order to do endpoint >'hunting' in any case. Even if the GK does not do any fancy footwork there is an issue. See below for example... > >>It may then have >>to change some of the fields before passing the message on. This will >>mean re-encoding the message. If there is a mis-match in the version of >>Capability supported by the endpoint and the gatekeeper then capability >>information will get lost in this process. > >Why is does the GK have any capabilities? It isn't a calleable >entity... >Gateways on the other hand will have to do this, but they have always >been >in the business of en/decoding the connection messages. A gatekeeper doesn't have media capabilities, but, due to the way we have coded the messages at the moment, it still has to be able to interpret the capability description sent to it from an endpoint. For example, if the GK wants to change the h245Address in a SETUP message, it first has to decode the message change the field, and then re-encode it. To decode the message it needs a definition of the H.245 Capability field. Hence, in many respects, it does have to know about capabilities. > > >>This means that endpoints >>will not be able to achieve end-to-end negotiation of caps, and any new >>codecs added by vendors will not be usable in this configuration. > >I fail to see where you draw this conclusion from. You seem to want to >put >the GK in the middle of all of this, exert great control, and remain >completely ignorant of any of the signalling that is occuring. There >is >no reason why the endpoints can not exchange their FastCaps end to end >unless the GK blocks them (as it can for any other exchange in the GK >routed model). Hopefully answered above. (But.... I only want to exert SOME control(!) and believe me it is far from ignorant of the signalling. What I want to do is remain TRANSPARENT to the latest features an endpoint supports and not be in the situation that I have no option but to erase them.) > >>As I >>envision faster evolution in the endpoint arena this seems a very real >>proposition. To get around this problem it may be best to include the >>capability information as an OCTET STRING. This allows the gatekeeper >>to look at it, > >So which do you want, to have it be opaque to the GK or to have the GK >be >able to interpret it? By making it an OCTET STRING the GK has the option to transparently pass it on, analyze it (and even if it doesn't fully understand it) pass it on, or change it. If we keep it as it is the GK can not act transparently. [SNIP] >>but also allows it to insert the information into an >>outgoing message without having to have decoded it and re-encoded it >>(i.e. it is just a copy operation) and so no information is lost. > >The GK can _always_ simply pass/copy the messages if it does not desire >to >provide some extended services during the call establishment (whatever >they >might be). Hopefully answered above... > >

1 0

Comments to H.bmultipoint draft V1.1
by Sakae Okubo 05 Jan '98

05 Jan '98

Dear Mr. Harasaki, Ms. Li Yan and other Q.12/16 experts, Attached please find some comments on the H.bmultipoint draft (Version 1.1). Best regards, Sakae OKUBO (Mr.) ******************************************************************** Graphics Communication Laboratories Phone: +81 3 5351 0181 6F ANNEX TOSHIN BLDG. Fax: +81 3 5351 0184 4-36-19 Yoyogi, Shibuya-ku, Tokyo e-mail: okubo(a)gctech.co.jp 151 Japan ******************************************************************** 1. Structure of Chapter 5 and Chapter 7 HH> Chapter 5 shall be a general system description, while chapter 7 HH> explicitly specifies how the MCU behave. What are the essential HH> specifications in Chapter 7? LY> I understand you want Chapter 5 to be a general system description LY> while chapter 7 to be MCU specifics. If Chapter 5 is intended for general explanation (general description of the system, not description of general system), use of "shall" would not be appropriate because it refers to specifications to be contained in Chapter 7. Furthermore, "characteristics" in sub-section titles also refers to specifications. I would suggest to leave in Chapter 5 the current 5.1 Various VC connection configurations, explanations of "meet-me" and "dial-out" and general configuration of MCU as described in 5.2 and illustrated in Figure 3, but to move other materials (5.3 and subsequent sub-sections) to Chapter 7 and merge them with the materials there. If this idea is agreeable, the title of the current 5.2 should exclude "characteristics" and the description should be without "shall". 2. Clock synchronization 2.1 General Technically this will be the most unique part of H.bmultipoint due to the fact that the H.310 native mode is based on the constant delay system that allows high quality audiovisual reproduction. First we should identify independent clocks in the system and then specify if they need be synchronized (see AVC-1024 for the 96/09 Eibsee meeting). 2.2 Independent clock sources Let us assume a system consisting of n terminals (numbered a to n) and an MP for the discussion purpose. There are two type of independent clocks; - STC (27 MHz) in each terminal and MP: STCa, STCb, ... STCn, and STCmp - Transfer rate clock like 96x64 kbit/s: TRa from terminal a to MP, TRb, ..., TRn and TRmp from MP to each terminal Here is assumed that MP uses single source of STC and single source of transfer rate clock for all the connections to terminals. 2.3 System implications If all clock sources were synchronized, the system design would be much simplified. However, would it be practical? If not, what system considerations be specified? For example, if TRa > TRmp in the cascaded connection from terminal a to MP then to terminal b, buffer overflow takes place at some point of time, which is catastrophic for decoding. 2.4 Audio processing at MP As far as audio mixing is used, all the incoming audio streams are decoded into sample domain, mixed as necessary and then re-coded. This will be according to the STC of MP (STCmp). There may be some audio sample skipping or repetition, but it is not objectionable (see Section 4.3.3/APC-1327). 2.5 Video processing at MP If video mixing is used, the same as above applies. Each video is decoded into sample domain according to its reproduced STC, some of video streams are mixed in the sample domain, then re-coded according to the STC of MP (STCmp). A picture frame may be dropped or repeated time to time. This is what happens to "frame synchronizer" (see also APC-1301). If video switching is used, the coded video stream to terminal a is switched, for example, from terminal b to terminal c without decoding to sample domain at MP. Values of DTS/PTS (and PCR as well?) should be changed according to the STC of MP (STCmp) to get synchronization between audio and video perceived at terminal a. Since the video stream from terminals b and c are based on STCb and STCc respectively and its decoded picture presentation is based on STCmp (different from STCb or STCc), video stream buffer will underflow or overflow as time passes. Overflow should be avoided as described in 2.3 above. 3. Figure 3 and functions of MC, MP, MR and Network Interface I am thinking in terms of the H.310 protocol stack as in Figure 2/H.310. Please confirm whether the following understanding is correct: 1) MC handles DSS2 call signalling and H.245 control signalling in AAL or higher layers of each port to the terminal. In addition to them, MC contains intelligence on top of DSS2 and H.245 handling to manage multiple ports participating in a multipoint conference. This intelligence corresponds to "Call Management" in Figure 2/H.310. The "Call Control" in MC should more appropriately be named "Call Management". 2) MP handles audio, video and data signals in AAL or higher layers. 3) MR handles ATM cells in the ATM layer? Or it handles signals above ATM (between ATM and AAL)? LY> 1a) Does MC talk to MR too? There is no connection between the two in LY> the diagram. I think MR is controlled by the intelligence "Call Management" as MP is. 4. Bit rate management We will need a sub-section in Section 7 which addresses how to manage elementary stream and multiplexed stream bit rate, particularly in the switched video environment. The description may not be normative, but give some guidance to the implementors. 5. Editorial comments Some editorial suggestions are given as annotations to the clean text of Version 1.1 in uuencoded Mac Word 6 file edit_com.mw6 as attached. This file is also placed at the Incoming directory of the GCL ftp site. END begin 666 edit_com.mw6 MT,\1X*&Q&N$ .P # /[_"0 & ! M 50 $ 6 $ #^____ %8 #_____________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M____________________________________________________________ M_______________________]____1 /[___]% !0 8 ' M" D * "P P - #@ \ 0 $0 !( 3 M % !4 6 %P !@ 9 &@ !L < '0 !X M ? 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M (<O ?2\ "$ V4" E@ ,DT #-- !&30 1TT M $Q- !-30 3DT & , 8 ?P !C-0 $& 7\ M 9'4 !DQ0 &35 LP 5!I !30!4:6UE<R!.97<@4F]M M86X # :0 0( 4WEM8F]L L&D %- $%R:6%L T&D %- $-O=7)I97( $0:0 M 4T 0V]U<FEE<B!.97< &2*0 0 -56YI=F5R<R H5S$I $%R:6%L /!I ! M30!(96QV971I8V$ )!*0 0 .0T<@5&EM97,@*%<Q*0!4:6UE<R!.97<@4F]M M86X 4A(BD $ %5N:79E<G,(a)*%=.*0 B 0 <8B(& T ( &@! &4L M(2:,+"$F , 0 $X= .IP %@!5 ! "#$&0! !/"P =D M !8 (0 (D -"8 0P "%4:&4@;W5T;&EN92!O9B!I;FET F:6%L(&1R869T(&]F($@ '86MA<V%K80=A:V%S86MA !O end

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Re: H.bmultipoint draft
by Hidenobu Harasaki 05 Jan '98

05 Jan '98

Dear Ms. Yan, Mr. Okubo and other Q.12 experts, Ms. Yan, thank you for your comments on H.bmultipoint draft version 1.1 and I'm sorry for this late reply. According to your and Mr. Okubo's comments, I have put revised Figure 3 as hbmul3v2.ppt in incoming directory of ftp.gctech.co.jp. The powerpoint file has two figures. One is single physical network interface version, the other is virtual network interface per peer version like H.231. Which figure is better? Should we need to include "call control" next to Network Interface? Li>> On 5.6, we only listed four H.245 commands/procedures. I think we Li>> need more to support multipoint. Should we list they all or we are not Li>> really sure what we really want? I think we should list all of the multipoint specific only. We should not repeat the same text found in H.310 version 2. Could you provide me specific text of the section? Please allow me a few more days to revise the draft to version 1.2. Any contributions toward the determination are solicited. Hidenobu Harasaki (harasaki(a)ccm.cl.nec.co.jp) editor for H.bmultipoint Principal Researcher C&C Media Research Labs., NEC Corporation Phone: +81 44 856 8083 Fax: +81 44 856 2232 P.S. to Mr. Okubo Please remove hbmulti3.ppt in your Incoming directory.

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Re: Typo in Gatekeeper discovery annex to H.225.0, etc.
by Tom Taylor 31 Dec '97

31 Dec '97

The discovery draft is at last call, on the way to be published as an experimental protocol RFC. >-----Original Message----- >From: Toby Nixon [SMTP:tnixon@MICROSOFT.COM] >Sent: Tuesday, December 30, 1997 8:38 PM >To: ITU-SG16(a)MAILBAG.INTEL.COM >Subject: Typo in Gatekeeper discovery annex to H.225.0, etc. > >[Taylor, Tom (P.T.)] [snip] >Also, I read with interest >ftp://ietf.org/internet-drafts/draft-ietf-svrloc-discovery-05.txt, which >suggests using "Service URLs" in TXT records as a fallback when SRV lookup >fails. This differs from (although it is very close to) the format of RAS >information in TXT records currently contained in H.225.0v2. Of course, this >is just a draft, and I have no idea how well it was received in IETF, but if >it gets legs, we may want to also add support for RAS URLs in TXT records >via the H.323v2 Implementor's Guide. Regardless, it would be helpful to >include a pointer to this draft -- or even an H.323-specific modified >version of it -- in the Implementor's Guide to help people get gatekeeper >discovery via DNS correctly implemented. >

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Suggesting Correction In H.235
by Lior Moscovici 31 Dec '97

31 Dec '97

There is a seeming inconsistency between the ASN.1 definition and section 10.3 in H.235: CryptoToken::= CHOICE { cryptoEncryptedToken SEQUENCE ? General purpose/application specific token { tokenOID OBJECT IDENTIFIER, token ENCRYPTED { EncodedGeneralToken } }, cryptoSignedToken SEQUENCE -- General purpose/application specific token { tokenOID OBJECT IDENTIFIER, token SIGNED { EncodedGeneralToken } }, cryptoHashedToken SEQUENCE -- General purpose/application specific token { tokenOID OBJECT IDENTIFIER, hashedVals ClearToken, token HASHED { EncodedGeneralToken } }, cryptoPwdEncr ENCRYPTED { EncodedPwdCertToken }, ... } According to section 10.3, additional choices for hashing and signature password based are needed: CryptoToken::= CHOICE { <OMITTED> cryptoPwdEncr ENCRYPTED { EncodedPwdCertToken }, <-- ************ ADD THE FOLLOWING:****************> hashedPwdEncr SEQUENCE { hashedTimeStamp TimeStamp, token HASHED { EncodedPwdCertToken } }, signedCertEncr SIGNED { EncodedPwdCertToken }, ... } Alternatively, one could use the general purpose cryptoSignedToken and cryptoHashedToken, but this is using non-standard (including an allocation of tokenOIDs) means to implement standard features... Lior.

1 0