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Total H.248 for engineers
Total H.248 training course description
A course focussing purely on the H.248 protocol. Anyone working through the ITU standards documents can testify to the need of a training course to explain how H.248 really works. This course already assumes knowledge of other VoIP protocols and starts by positioning H.248 in relation to the other protocols. The course then looks at H.248 architectures and concepts before analysing H.248 messages and call flows.

Who will benefit?
Technical staff working with H.248

Total H.248 training course prerequisites
Voice Over IP.

Total H.248 training course objectives
By the end of the course delegates will be able to:
  • Describe what H.248 is
  • Recognise where H.248 fits in relation to other VoIP protocols.
  • Explain how H.248 works.
  • Analyse H.248 packets

Duration: 2 days



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Total H.248 training course contents

What is H.248?
Review of VoIP protocols: RTP, RTCP, SIP, SDP, H.323. The PSTN and SS7. Where H.248 fits into the picture. H.248 history. MGCP. The IETF. Megaco. ITU standards. H.248v1, v2, v3.

H.248 architectures
Media Gateways, Media Gateway Controllers, Gateway Control functions, Signalling Gateways. Reference architectures: IMS/TISPAN: IBCF, IWF, I-BGF, SPDF. MSF: S-SBG-NC, D-SBG-NC. GSMA: IPX Proxy. Softswitches.

H.248 concepts
The connection model, terminations, streams, contexts. Termination properties: descriptors, context properties. Events, signals, packages.

H.248 messages
Protocol stack, UDP, TCP. Message structure. Transactions, actions, commands. Requests, replies, acknowledgements. Sample message flows. Binary encoding, ASN syntax, Text encoding.

H.248 commands
Termination manipulation: Add, Subtract, Move, Modify. Event reporting: Notify. Management: AuditCapability, AuditValue, ServiceChange.

H.248 Descriptors
What are descriptors? Relationship with messages and commands. Basic descriptors, Descriptors composed of other descriptors. The 19 descriptors. Defaults.

H.248 Transactions
Groups of commands, transaction Ids, relationship with actions and commands. Requests and replies.

H.248 wrap up
What is a package? Basic packages. H.248 security. H.248 – SIP interoperation. H.248 interoperation with other protocols.