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Launceston meeting
by OKUBO Sakae 22 Feb '01

22 Feb '01

Dear SG16 experts, We have obtained the final approval of the SG16 management to hold the Q. D,F,G,2-5/16 Launceston meeting during 5-9 March 2001. Mr. Christian Groves, meeting host, has advised us that the number of participants is 45 as of 21 February. Best regards, OKUBO Sakae *********************************************************** Waseda Research Center Telecommunications Advancement Organization of Japan (TAO) 5th Floor, Nishi-Waseda Bldg. 1-21-1 Nishi-Waseda, Shinjuku-ku, Tokyo … [View More]

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H.248 protocol stack
by YouLing Sha 21 Feb '01

21 Feb '01

Hi, Can anyone help me to know the Megaco/H.248 protocol vendors available today? To implement Media Gateway, is there any differences between Megaco stack and H.248 stack? Thanks. Regards, YouLing Sha CyberPath Inc. (732) 463-7700 ext. 304 ysha(a)cyberpathinc.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com

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Re: a query
by Li, John 21 Feb '01

21 Feb '01

within the internet clouds, many protocols can be used to pass the signaling information, eg. SIP, H323 or even ISUP/TCP. Refer to SIP RFC or H323 spec. for details. thanks, John -----Original Message----- From: Alok Dubey (OCS-BLRAKS-AVS) [mailto:adubey@wipro.co.in] Sent: Wednesday, February 21, 2001 3:12 PM To: 'Li, John ' Cc: 'ITU-SG16(a)mailbag.cps.INTEL.COM' Subject: RE: a query hi, I agree it goes via SG to MGC..but that is when im going acros medias....POTS to VOIP etc.. but … [View More]within the IP cloud.. how does the signalling take place.. eg from VOIP to VOIP.. lets say i have 1 MGC (or u can assume this to be an IP phone too) A and another ip phone B in a diff LAN seg ( or a POTs phone attachd to a different gateway...) now when i call from A( if its an MGC ill use A as a gateway) to B , A uses the gatekeeper/callmanager to get the number (ARQ) and then depending on the mode of call.. . it sets up the call from A to B by either going via the gateway or by seting up the session directly.. now this part of the signalling is what i am interested in.. is it ordinary TCP/IP with some good old ports or is it RTP too? if it isnt.. as u put it .. how do i make my network elements mark/identify and prioritise this traffic. will i have to do it at the ingress node.ie when it enters the network? and what is the content of the packet? ..is it well defined? Rgds Alok -----Original Message----- From: Li, John To: 'Alok Dubey (OCS-BLRAKS-AVS)' Sent: 2/22/01 1:08 AM Subject: RE: a query Alok, The call control messages (including setup) usually goes thru the signaling path via SG and MGC. RTP is used for the media tranfer. Hope it helps. John -----Original Message----- From: Alok Dubey (OCS-BLRAKS-AVS) [mailto:adubey@WIPRO.CO.IN] Sent: Wednesday, February 21, 2001 2:13 PM To: ITU-SG16(a)mailbag.cps.INTEL.COM Subject: a query hi im sorry for posing this query out here but i needed this answer asap.. Im basically more of an implementor than a protocol developer and all my job is above the layer 3.. ie socket programming etc. Right now while going thru the specs, I could not find any reasonable explanation on how u prioritise traffic for call setup? for eg are u sending callsetup info over RTP ports too..? if yes, i still have to figure out how to use Voice Activity Detection to conserve bandwidth a feature which lets us drop voice packets below a certain db level .., if no this basically means that setting up a call could take a long time and the traffic associated with it cannot be controlled/prioritised.. can anyone refer me to any good specs Sorry to be wasting ur time on such a query.. but i couldnt think of a better place to pose this question. Rgds Alok ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com [View Less]

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Re: a query
by Alok Dubey (OCS-BLRAKS-AVS) 21 Feb '01

21 Feb '01

hi, I agree it goes via SG to MGC..but that is when im going acros medias....POTS to VOIP etc.. but within the IP cloud.. how does the signalling take place.. eg from VOIP to VOIP.. lets say i have 1 MGC (or u can assume this to be an IP phone too) A and another ip phone B in a diff LAN seg ( or a POTs phone attachd to a different gateway...) now when i call from A( if its an MGC ill use A as a gateway) to B , A uses the gatekeeper/callmanager to get the number (ARQ) and then depending on … [View More]the mode of call.. . it sets up the call from A to B by either going via the gateway or by seting up the session directly.. now this part of the signalling is what i am interested in.. is it ordinary TCP/IP with some good old ports or is it RTP too? if it isnt.. as u put it .. how do i make my network elements mark/identify and prioritise this traffic. will i have to do it at the ingress node.ie when it enters the network? and what is the content of the packet? ..is it well defined? Rgds Alok -----Original Message----- From: Li, John To: 'Alok Dubey (OCS-BLRAKS-AVS)' Sent: 2/22/01 1:08 AM Subject: RE: a query Alok, The call control messages (including setup) usually goes thru the signaling path via SG and MGC. RTP is used for the media tranfer. Hope it helps. John -----Original Message----- From: Alok Dubey (OCS-BLRAKS-AVS) [mailto:adubey@WIPRO.CO.IN] Sent: Wednesday, February 21, 2001 2:13 PM To: ITU-SG16(a)mailbag.cps.INTEL.COM Subject: a query hi im sorry for posing this query out here but i needed this answer asap.. Im basically more of an implementor than a protocol developer and all my job is above the layer 3.. ie socket programming etc. Right now while going thru the specs, I could not find any reasonable explanation on how u prioritise traffic for call setup? for eg are u sending callsetup info over RTP ports too..? if yes, i still have to figure out how to use Voice Activity Detection to conserve bandwidth a feature which lets us drop voice packets below a certain db level .., if no this basically means that setting up a call could take a long time and the traffic associated with it cannot be controlled/prioritised.. can anyone refer me to any good specs Sorry to be wasting ur time on such a query.. but i couldnt think of a better place to pose this question. Rgds Alok ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com [View Less]

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H.225.0 Annex G
by Douglas Clowes 21 Feb '01

21 Feb '01

Has anybody implemented Inter-domain communication = what is the state of implementation of this recommendation? Is anybody using it (has it deployed)? TIA, Douglas ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com

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Anybody using GSM HR or EFR codecs?
by Douglas Clowes 21 Feb '01

21 Feb '01

Anybody at all? If so, what RTP payload types do you use and how do you signal the RTP payload type in the Fast Start, OLC and/or OLCACK? Douglas At 06:56 20/02/2001 +1100, Douglas Clowes wrote: >Could some kind soul please point me to the definitive guide to the use of >RTP dynamic payload types in H.245. I've looked and can't seem to find any >adequate coverage. > >If anybody has firm ideas how it's done, I would be pleased to receive the >benefit of their knowledge. > … [View More]

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AW: Video codec for H.323 Annex I
by Baese Gero 21 Feb '01

21 Feb '01

Dear Mr. Campos-Neto, experts, thank you very much Mr. Campos-Neto for this excellent proposal. Hopefully there will be a third party providing the bitstreams and an decoder executable for the tests. The deadline to submit the documents is on the 26t of February. If there is a third party willing to help us out please react quickly. Otherwise we will have to use our own implementations leading to not comparable results. In this special case, perhaps the group can accept us providing the … [View More]

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Usage of H.248 in ServiceControlDescriptor
by Paul, Manoj 20 Feb '01

20 Feb '01

With reference to H.323 Annex K, ServiceControlDescriptor has following ASN.1 syntax: ServiceControlDescriptor ::= CHOICE { url IA5String (SIZE(0..512)), -- indicates a URL-referenced -- protocol/resource signal H248SignalsDescriptor, nonStandard NonStandardParameter, callCreditServiceControl … [View More]

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Transfer Mode encoding in Bearer Capability
by Aggarwal, Mitu 20 Feb '01

20 Feb '01

The encoding of the Bearer Capabilities as defined by H.225 version 2 specs in section 7.2.2.1, says that the Transfer Mode SHALL specify "circuit mode". Can anyone tell me why H.225 chooses to use "circuit mode" instead of "packet mode"? Q.931 in fact specifies that this field should be encoded as "packet mode". Regards, Mitu Aggarwal Intel Corp. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv(a)mailbag.intel.com

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suscribe
by Aziz ABOUCHI 20 Feb '01

20 Feb '01

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