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Definitive H.323 for engineers  |    A 2 day   hands on   training course

H.323 training course description

A hands on course covering IP telephony with H.323. The course starts with a brief review of knowledge students should already possess including RTP and RTCP. The main focus is on H.323 protocols though, progressing from what H.323 is through signalling, call processing and architectures, moving onto more advanced issues including security, multimedia, conferencing, and interoperability. Hands on practicals follow each major theory session.

What will you learn
  • Explain how H.323 works.
  • Analyse H.323 packets.
  • Deploy H.323 IP telephony solutions.
  • Integrate H.323 with other telephony solutions.
H.323 training course details
  • Who will benefit:
  • Technical staff working with H.323

  • Prerequisites:
  • Voice Over IP

  • Duration
  • 2 days

  • Dates & prices
  • Click here

H.323 training course contents

  • VoIP review
  • Brief review of VoIP, IP, telephones and voice. RTP, RTCP, mixers and translators.

  • What is H.323?
  • The framework, Why H.323, history, H.323 standards and the ITU, H.323 versions 1,2,3,4, and 5, Annexes and Appendices, capabilities, services, How H.323 works, a basic call.

  • H.323 protocol stack
  • The overall framework, Audio codecs (H.7xx), Video codecs (H.26x), T.120 data conferencing.

  • H.323 Architecture
  • Endpoints: Terminals, MCUs, gateways. Gatekeepers, border and peer elements, design issues, signalling with and without gatekeepers.

  • H.225
  • Packet format, ASN.1, Information elements, Call setup, Call control.

  • Gatekeepers
  • Gatekeeper features, admissions, address translation, bandwidth management, call routing, zones, administrative domains, gatekeeper discovery, call establishment, fast connect. RAS packet formats, RAS signalling. Alternate gatekeepers.

  • H.245
  • Purpose, call control channel, relationship with H.225, message format, tunnelling.

  • H.323 Supplementary services
  • Conferencing: point to point, multipoint, hybrid, broadcast, H.332. H.450.x. Call transfer, diversion, hold and waiting. Remote device control (H.282, H.283). Capability exchange, Video.

  • Security
  • H.235. Authentication, privacy, transport layer level security.

  • Interoperability
  • Gateways, Inter working with PSTN, SIP and H323. H.246.

  • Annexes and Appendices
  • An overview.

Learning path


Based on customer ratings

P. B. - CGG Veritas

"Very good instruction. Kept classes interesting and fun."

T. B. - BAE Systems

"The course gave the required amount of information and was very well presented."

Training approach

This structured training course seeks to build upon workbook learning through the use of group exercises, dynamic discussion and individual tasks in order to deliver an engaging and interactive module that will ensure all candidates are able to transfer their new skills into the workplace.