VoIP scenarios: classical telecommunications networks, separate data and voice networks versus unified networks, migration path to VoIP, least cost routing - today and tomorrow, VoIP - pro and contra, Overview of the H.323 multimedia communication standard. Video compression: H.261 / H.262 and H.263 DCT-based compression algorithms, macroblock based encoding of color information, motion vector estimation, group of pictures difference coding scheme, video conferencing picture formats. Audio compression: G.711 pulse code modulation @ 64 kbit/s, G.722 adaptive differential pulse code modulation @ 64/32 kbit/s, linear prediction coder @ 2.5 kbit/s, G.728 code excited linear prediction coder @ 16 kbit/s, G.729 audio code for frame relay @ 8 kbit/s, GSM 06.10 enhanced full rate coder @ 13 kbit/s, mean opinion score (MOS). H.32x family: H.320 videoconferencing over ISDN, H.324 videoconferencing over POTS.

Distribution Format:

• PowerPoint presentation with detailed comments in PDF format

H.323 network components: terminals, gatekeepers, gateways, multipoint control units. H.323 gateway: gateway to PSTN, protocol translation, audio/video transcoding. H.323 gatekeeper: H.323 zones, automatic gatekeeper discovery, endpoint registration, unregistration, location and admission to network. H.323 call setup and control: Q.931 call signalling channel (gatekeeper-routed and direct call setup), H.245 control channel (gatekeeper-routed and direct control), H.245 capabilities exchange. Channel multiplexing: H.225.0 channel multiplexing, transport of logical channels over IP-based networks using UDP and TCP). Multipoint conferences: Multipoint control and multipoint processor functions for multipoint conferencing, centralized and decentralized multipoint conferences. Session Initiation Protocol (SIP): SIP uniform resource locators, SIP invitation using a SIP proxy server, example of an INVITE request.

Distribution Format:

• PowerPoint presentation with detailed comments in PDF format