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Definitive H.323 for engineers
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.

Who will benefit?
Technical staff working with H.323.

H.323 training course prerequisites
Voice Over IP.

H.323 training course objectives
By the end of the course delegates will be able to:
  • Explain how H.323 works.
  • Analyse H.323 packets.
  • Deploy H.323 IP telephony solutions.
  • Integrate H.323 with other telephony solutions.

Duration: 2 days



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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