J. S., Framestore CFC
B. M., London Internet Exchange
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.
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.
The connection model, terminations, streams, contexts. Termination properties: descriptors, context properties. Events, signals, packages.
Protocol stack, UDP, TCP. Message structure. Transactions, actions, commands. Requests, replies, acknowledgements. Sample message flows. Binary encoding, ASN syntax, Text encoding.
Termination manipulation: Add, Subtract, Move, Modify. Event reporting: Notify. Management: AuditCapability, AuditValue, ServiceChange.
What are descriptors? Relationship with messages and commands. Basic descriptors, Descriptors composed of other descriptors. The 19 descriptors. Defaults.
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.
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