February 1998 - sg16-avd - lists.packetizer.com

Re: H.245 OCTET STRINGs
by Mike Nilsson 18 Feb '98

18 Feb '98

Jim, I think it is just a matter of compiler options. We are using the OSS tools. If no options are set, there are many such warnings, and the resulting H.245 structure is about 32 Mbytes. This seems to be because by default all parts of the structure (except object IDs) are included, as specified, in a union. To eliminate the warnings and reduce the structure size to something manageable we have used the options --<LINKED SET OF, SEQUENCE OF , OCTET STRING>-- This causes the compiler to create a structure with pointers to objects rather than a structure with the objects included directly. Best regards Mike ************************************************************************ * Mike Nilsson Tel: +44 1473 645413 * * Video Processing Unit Fax: +44 1473 643791 * * Centre for Human Communications Email: mike.nilsson(a)bt-sys.bt.co.uk * * BT Laboratories [MLB3/11] * * Martlesham Heath * * Ipswich IP5 7RE * * UK * ************************************************************************ >---------- >From: Jim Toga[SMTP:jtoga@jf.intel.com] >Sent: 17 February 1998 21:44 >To: itu-sg16(a)mailbag.jf.intel.com >Cc: mike.nilsson(a)BT-SYS.BT.CO.UK; dskran(a)ascend.com; >mreid(a)videoserver.com >Subject: H.245 OCTET STRINGs > >It has come to my attention that there are a number of OCTET STRINGS >defined in H.245 along the lines of > > "h235Key OCTET STRING (SIZE(1..65535))" > > "value OCTET STRING (SIZE(1..65535))" > > "certificateResponse OCTET STRING (SIZE(1..65535)) >OPTIONAL" > >The problem with these difinitions is that with the terminating NULL ( >I >think...) the lentgh goes over by one byte, a 64k block of data. The >OSS >compiler generates the following warning, which goes away if we change >the >lenth to '65534'.... > > >"h245.asn", line 1941 (MULTIMEDIA-SYSTEM-CONTROL): C0470W: The size of >the >generated C structure for the SET OF or SEQUENCE OF exceeds 64K bytes >and may >adversely affect CPU and memory performance. Consider use of the >LINKED or >UNBOUNDED directive. > > >Comments?....fixes?...... > >jimt. > > > > >************************************************************************ >* >*** +1-503-264-8816(voice) +1-503-264-3485(fax) >*** >*** jtoga(a)ideal.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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Q.931 for MCU
by Vincent Chen 17 Feb '98

17 Feb '98

Dear All, Is it correct that an MCU just act as a Q.931 USER but not a Q.931 NETWORK? Thanks! Best Regards, Vincent Chen E-mail:VincentSHChen@acer.com.tw

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Re: Q.931 for MCU
by isabelle haignere 17 Feb '98

17 Feb '98

Hi Vincent, What does it mean ? From the user information point of view, you mean ? Isabelle Haignere isabelle.haignere(a)cnet.francetelecom.fr At 14:48 17/02/1998 GMT, you wrote: >Reply-To: "Mailing list for parties associated with ITU-T Study Group 16" <ITU-SG16(a)mailbag.jf.intel.com> >Importance: Normal >X-Mailer: ccMail Link to SMTP R8.00.01 >MIME-Version: 1.0 >Content-Type: text/plain; charset=US-ASCII >Content-Transfer-Encoding: 7bit > > Dear All, > > Is it correct that an MCU just act as a Q.931 USER but not a Q.931 > NETWORK? Thanks! > > Best Regards, > Vincent Chen > E-mail:VincentSHChen@acer.com.tw > > > --------------------------------------------------- Isabelle HAIGNERE FT/BD - CNET/DSE/SGV 38-40 rue du general Leclerc 92131 Issy-Moulineaux Tel : 33 1 45 29 40 08 Fax : 33 1 45 29 52 94 Email : isabelle.haignere(a)cnet.francetelecom.fr ---------------------------------------------------

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Re: Q.931 for MCU
by Ami Amir 17 Feb '98

17 Feb '98

Hi Vincent All of the Q.931 messages are user side (end point, MCU and gateway) Ami Amir RADVision -----Original Message----- From: Vincent Chen [SMTP:vincentshchen@ACER.COM.TW] Sent: Sat, January 17, 1998 2:21 PM To: ITU-SG16(a)mailbag.jf.intel.com Subject: Q.931 for MCU Dear All, Is it correct that an MCU just act as a Q.931 USER but not a Q.931 NETWORK? Thanks! Best Regards, Vincent Chen E-mail:VincentSHChen@acer.com.tw

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H.323, H.320 and H.324
by Brian A. Root 17 Feb '98

17 Feb '98

Hi. My name is Brian Root. I am trying to organize a family of products for a moderate size wireless Internet access company to offer for video conferencing. The company provides wireless 10Mbs connections two hops away from T3 or greater connections to the InterNet and one hop between their 40 areas of current coverage, so bandwidth is not a problem, interconnectivity is. I know about VideoServers product line that allows interconnectivity/bridging between H.323 and H.320 products. What I do not know is the interconnectivity between H.323, H.320 and H.324 products. From my understanding, products that support H.324 are mainly for dial up connectivity over POTS lines, but also provide LAN connectivity. Is this the connectivity that is represented by H.323? If not, do you know of any products like the VideoServer product that bridge H.320, H.323 and H.324 products? Thank you. Brian Root UBI 504-266-3560

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Re: Compatibility
by Chris Purvis WVdevmt-WS 17 Feb '98

17 Feb '98

>I have purchased a TV Phone which uses ITU-T Standard H.324. Will I be able >to videoconference with someone using an H.320 system. Not until someone builds the appropriate gateway. ---------------------------------------- Dr Chris Purvis - Senior Development Engineer, WAVE CC Software Madge Networks Ltd, Wexham Springs, Framewood Road, Wexham, Berks. Phone:+44 1753 661359 email: cpurvis(a)madge.com

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Compatibility
by Fp41326＠AOL.COM 16 Feb '98

16 Feb '98

I have purchased a TV Phone which uses ITU-T Standard H.324. Will I be able to videoconference with someone using an H.320 system. Thanks Joe Peck

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None
by Martin Laczko 15 Feb '98

15 Feb '98

LIST GLOBAL/Q.850

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FW: Remote Device Control Conference
by Gary Thom 15 Feb '98

15 Feb '98

FYI, ---------------Original Message--------------- On Thursday May 7, 1998 an audio conference to discuss Remote Device Control (RDC) has been scheduled at 11:00 AM Eastern Time. The telephone number is +1-212-547-0228, with a passcode of 1139. The bridge will be available for 2 hours. [I assume Bruce DeGrasse or John Boucher will forward this information to other reflectors as needed.] -- Murry ----------------------------------------------------------------------- Murry McEntire Senior Engineer networkMCI Conferencing email: Murry.McEntire(a)mci.com phone: 719 535-6954 vnet: 622-6954 MCI, 4177/117, 2424 Garden of the Gods Road, Colorado Springs, CO 80919 ----------------------------------------------------------------------- ----------End of Original Message---------- ------------------------------------- Name: gary thom E-mail: gthom(a)delta-info.com Date: 02/05/98 Time: 01:14:03 -------------------------------------

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Please Add me to the reflector
by Robert Kaplan 13 Feb '98

13 Feb '98

Robert Kaplan Director Product Development AC & E, Ltd 14101 Sullyfield Circle Chantilly, VA 20151 Phone: (703) 968-5700 Fax: (703) 968-4331 rkaplan(a)aceltd.com

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