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How To Implement H.323 Presented at the Joint Techs Workshop 28 - 31 January 2001 University of Hawaii, Honolulu, HA By Larry Amiot (NWU/I2) and Tyler Miller Johnson (UNC) Today’s Agenda Video Conferencing Environment H.323 Video Conferencing Basics ITU Standard

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How To Implement H.323

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How To Implement H.323

Presented at the

Joint Techs Workshop

28 - 31 January 2001

University of Hawaii, Honolulu, HA

By Larry Amiot (NWU/I2) and

Tyler Miller Johnson (UNC)

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Today’s Agenda

  • Video Conferencing Environment

  • H.323 Video Conferencing

    • Basics

    • ITU Standard

    • Addressing and Zone Management

  • H.323 Deployment

  • Internet2 Video Conferencing Service

  • Applications in the Educational Environment

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Video Conferencing Environment

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Digital Video In The Educational Environment

  • Classroom presentations- need for video clips

  • Colloquiums- need to broadcast on the network

  • Homework Assignments- Video-based reference material

  • Collaborative classes- need for remote interaction between class participants

  • Committee meetings- need for remote interaction between participants

  • Informal collaboration- need for remote interaction between colleagues

  • Conference presentations- need for remote interaction between presenters and audience

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Parts of the Puzzle

  • Web-based Virtual Classroom

  • Collaborative Tools

    • Application sharing

    • White board

    • Chat window

  • Video Conferencing

  • Real-time Streamed Video

  • Archived Video

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Video Conferencing Alternatives

  • ISDN-based

    • H.320 (Legacy)

  • Internet-based

    • Access Grid

    • Virtual Room Videoconferencing System (VRVS)

    • MPEG2 Multicast

    • H.323

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H.323 Video Conferencing

  • H.323 Video Conferencing is becoming widely used in the educational environment.

    • Staff meetings

    • Working Group meetings

    • Collaborations

    • Interactive classes

    • Conference tracks

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ViDeNet: A Business Case

  • ViDeNet is one current model for deployment

  • Voice-Over-IP integration driving the business case

  • Research applications driving video implementations

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H.323 Video Conferencing


ITU Standard

Addressing and Zone Management

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H.323 Standard

  • Umbrella set of standards defining real-time multimedia communications and conferencing over packet-based networks

  • International Telecommunications Union (ITU) finalized Version 1 in 1996

  • Version 2 approved January 1998

  • Part of the family H.32x standards

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H.323 Standard

  • Version 2 added

    • Security (H.235)

      • Authentication/Authorization

      • Integrity

      • Privacy

      • Non-Repudiation

    • Fast call setup

    • T.120/H.323 integration

    • Supplementary services

      • Call transfer

      • Call diversion

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H.323 Standard

  • H.323 Components

    • Terminals (Clients)

    • Gateways

    • GateKeepers

    • Multipoint Control Units (MCU’s)

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H.323 Standard

  • H.323 standard covers

    • Voice- required

    • Video- optional

    • Data- optional

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Real Video

Web Browser

H.323 Video Conferencing


H.323 Clients

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Pieces of H.323

  • Audio Codecs

    • G.711 (required), G.722, G.723, G.728, G.729

  • Video Codecs

    • H.261 (required), H.263

  • Data Sharing

    • T.120, T.125 Annex A (multicast)

  • Call Control

    • H.245

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H.323 Protocol Stack

A/V Control










H.225 (Q.931)







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H.323 Standard

  • Gatekeeper required functions

    • Address translation

    • Admissions control

    • Bandwidth control

    • Zone management

  • Optional functions

    • Call control signaling

    • Call authorization

    • Bandwidth management

    • Call management

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H.323 Zone

  • Gatekeeper (master control)

  • Multipoint Control Unit (MCU)

  • Gateway

  • Endpoints

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AddressingH.323 Concepts

  • Three intraZone Dialing Modes

    • By IP address – not recommended

    • By Alias (trjohns1 or

    • By Extension (226.6101)

  • Interzone Dialing

    • ‘Neighbor’ tables – current ViDeNet practice

    • Automatic Destination Zone Resolution

      • Peer to peer

      • Hierarchical

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0 (168 245 929) 226.6101


Zone Prefix

Exit Zone Prefix

AddressingInterfacing to the PSTN




+1 (919) 226.6101



IP Network

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And Directory Services






ViDeNet Peer to Peer Gatekeepers

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H.323 Standard

  • Gateways are optional elements of H.323 that communicate with:

    • PSTN analog terminals

    • H.320 terminals via ISDN networks

    • H.321 terminals over ATM

    • H.324 terminals over PSTN networks

    • Other

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H.323 Video Conferencing






Real Video


Web Browser

H.323 Clients

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H.323 Deployment

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H.450 Fancy Services


Unified Messaging



H.235 Security

NT Gatekeeper

Unix Gatekeeper

Ethernet Power

USB Desktops

Cable TV Over IP

H.323 Phones

VC Appliances

Rack Mount CODECs

Wireless H.323

LDAP Gatekeeper

PCI Desktops












H.323 Deployment Events

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Conference Room Appliance

Performance: Very Good

Price: $2500 - $8000

Desktop Video

Performance: Fair to Good

Price: $500 - $1000

Teleclass Codec

Performance: Excellent

Price: $10,000

IP Phone

Performance: Excellent

Price: $150 - $500

Wireless IP Phone

Performance: Very Good

Price: $250 - $600

Soft Phone

Performance: Fair

Price: $0 - $50

Fax / Modem Appliance

Performance: Good

Price: $150 -$500

Choose Your Connection

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Management Server (Directory Services)

Embedded, Distributed,

Load Balancing

NT / Unix / VxWorks






Embedded, Distributed,

Load Balancing

NT / Unix / VxWorks








Embedded, Distributed,

Load Balancing

NT / Unix / VxWorks

In The Zone

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RADVision NGK-100/200

RADVision embedded gatekeeper

RADVision ECM / ViaIP400 *beta

Cisco MCM


RADVision MCU-323

RADVision ViaIP 400 platform, 100-port *beta

Accord (including h.321 gateway)

Siemens LP5100 - IP telephone ($400)


RADVision L2W-323



Polycom VS4000 - discrete codec ($10,000)

Polycom ViewStation - conference room in a box ($4000)

VCON ViGo Standard - desktop / laptop USB solution ($550)

VCON ViGo PRO - desktop / laptop USB solution/ Speaker, 2Mbps, & multicast support ($1199)

Polycom ViaVideo - desktop / laptop USB solution ($400)

Siemens LP5100 - IP telephone ($400)

Popular Equipment

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Audio & Video Streams (N*2*384Kbps)


H.323 Video Conferencing

Bandwidth Requirements

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Staffing for H.323

  • Offering H.323 Services Requires

    • Account Management

      • ‘Free-love’ zones

      • Explicitly defined users

    • Systems Administration

    • Directory Services

    • Monitoring 7x24

    • Web Documentation

    • Training

    • Initial Client Installation

    • Purchasing Assistance and Consultation

    • Help Desk

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ViDeNet Participants50 and counting …

Texas A&M University

University of Akron - Wayne College

University of Alabama

University of Colorado at Denver

University of Hawaii

University of Illinois at Chicago

University of Illinois at Urbana-Champaign

University of Missouri at Kansas City

University of New Brunswick (Canada)

University of North Carolina

University of Pennsylvania

University of South Carolina

University of Tennessee

University of Virginia

Virginia Commonwealth University

Wright State University (Ohio)

Yale University (Connecticut)

American University in Cairo (Egypt)

Aristotle University of Thessaloniki (Greece)

Beijing Institute of Technology (China)

Canarie (Canada)

CiCV (France)

CINECA (Italy)

The College of William and Mary (Virginia)

Columbia University (New York)

ESnet (US Nuclear Laboratories)

The Georgia Institute of Technology

HEAnet (Ireland)

IIUCC (Israel)

Indiana University


Louisiana State University

MCNC (North Carolina)

Mississippi State University

National Sun Yat-Sen University (Taiwan)

National Technical University of Athens

North Carolina State University

NYSERnet (New York)

OARNet (Ohio)

Ohio State University

Oklahoma State University

OneNet (Oklahoma)

Pennsylvania State University

Procter and Gamble (Ohio)

RADVision (Tel Aviv)

SURFnet (the Netherlands)

Tel Hai College (Israel)

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Internet2 Video Conferencing Service

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Collaborative Video Conferencing Services over Internet2 Initiative

  • Provide a service that is intended to enable one-to-one, one-to-group, and group-to-group collaborative conferencing in support of personal communication, meetings, conferences, and shared education for Internet2 members (primary and sponsored) and their international counterparts.

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Basic Tenets of Service

  • Independent of geographic or national boundaries

  • Video conferencing viewed as current best collaborative environment

  • Gateways between technologies will be necessary

  • Gateways must be transparent to end users

  • Need to consider voice/telephony integration

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Key Technical Issues

  • A Global Dialing Plan

  • A Global Directory Service

  • A Scheduling Mechanism for the use of shared resources

  • Improvements and coordination in “back room” functionality and control

  • Interoperability with other significant communication services (gateways)

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Key Technical Issues (Continued)

  • QoS

  • Multicast

  • H.235 Security

    • Authentication/Authorization

    • Integrity

    • Privacy

    • Non-Repudiation

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White Paper Developers

  • Service Implementation Team

  • Funding Task Force

  • Operations Task Force

  • Research & Development Task Force

  • Outreach & Communication Task Force

Collaborative Video Conferencing Services over Internet2

I2DV Steering Committee

I2DV-VC Sub-Committee

Implementation Plan Development Team

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Proposed Prototype Service

  • Focus on deployment not research

  • Start with single technology

  • Recommended that that prototype service be based on H.323 technology

  • Based on contributed resources

  • Based on distributed management

  • Based on distributed systems

  • Emphasis on Gateways (centralized if necessary)

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Applications in the Educational Environment

By Dr. Robert Dixon, Ohio State University

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H.323 Examples

  • Megaconference1

    • Fall 1999 Internet2 meeting

    • Over 50 sites from all over the world

    • 384Kbps

    • Cascaded MCUs

  • Megaconference2


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  • Fall 2000 Internet2 meeting.

  • World’s first totally remote conference track.

  • Empty lectern.

  • Worldwide interactive audience.

  • 114 End points; 28 Multipoint Control Units.

  • The model for all future conferences on all subjects.

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Megaconference2 Presentations

  • Use of H.323 Technology in CINECA Activities

  • Material World Module(MWM) & virtual institute

  • Use of IP Video for Distance Surgical Education

  • University of Venice Experiences

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Use of IP Video for Distance Surgical Education

  • Jerome Johnson (OSU), Presenter

  • Laparoscopic Surgery

    • Surgical instruments & small camera inserted through incision in abdomen

    • Surgery performed watching TV

    • Consultation via 2-Way Real-time video

    • Instruction via Real-time Video

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Megaconference2 Presentations

  • Generation X and Generation D Learning in the ZPD with H.323: Literacy Strategy Lessons from Rural America

  • Wireless Distribution of H.323 Videoconferencing in a Trauma Center Emergency Department

  • Tools for Extending Classroom Walls via the Internet

  • Work and Life in an Antarctic Station

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Work and Life in an Antarctic Station

  • Hans Pfeiffenberger (Alfred Wegener Institute), Presenter

  • Neumayer Station in Antarctica at 70 deg. South

  • 384Kbps satellite link to Bremerhaven, Germany

  • Weekly conferences to interested school classes and museum visitors

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Megaconference2 Presentations

  • LSVNP - A Managed Prototype for H.323 Zones

  • A Multi-University Internet-based (H.323) Graduate Course in Turbulence

  • Distance Learning using H.323; A Singapore-MIT experience

  • Bodyworks: Medicine, Technology, and the Body in the late 20th Century

  • Advanced Collaboration Tools to Support Multi-University Collaborative Learning in Organizational Communication

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Collaborative Learning in Organizational Communication

  • Noshir Contractor (UIUC), Presenter

  • Fall 1998 to Fall 2000

  • Real-time Graduate Seminar Courses

    • Globalization

    • Social Network Analysis

    • Communication Technologies & New Forms of Organizing

  • Faculty at:

    • University of Illinois

    • Purdue University

    • University of Southern California

    • University of Pennsylvania

    • University of California at Santa Barbara

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  • Internet2 Digital Video


  • Megaconference


  • ViDeNet


  • Videoconferencing Cookbook


  • VRVS




  • Access Grid


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How To Implement H.323

Presented at the

Joint Techs Workshop

28 - 31 January 2001

University of Hawaii, Honolulu, HA

By Larry Amiot (NWU/I2) and

Tyler Johnson (UNC)

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