Alfredo Terzoli / Mosioua Tsietsi

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Presentation transcript:

Alfredo Terzoli / Mosioua Tsietsi RTMMoIP Alfredo Terzoli / Mosioua Tsietsi

A conversation becomes DATA

And it is tranported…

Another view!

VoIP bandwith calculation Let’s get more specific on B/W usage, for AUDIO transmission Two families of CODECS: wave coding unrestricted, any sound (sound engineering) vocoding good for voice, can reach very low bitrates kbps: kilo bits per second (here kilo=1000, not 1024!)

‘Vocoders’ for Videos?

Voice Synthesisers & Vocoders A voice synthesiser includes a vocoder of some type, naturally In fact, using a voice synthesiser one can substantially reduce the bandwidth needed for the transmission of voice. HOW? (BTW, who knows how MIDI works?)

B/W consumption of a few codecs

VoIP bandwith calculation

VoIP bandwith calculation

Bandwidth calculators at: http://www.newport-networks.com/pages/voip-bandwidth-calculator.html (btw, the white paper distributed to you on b/w calculation comes from newport-networks) http://www.packetizer.com/voip/diagnostics/bandcalc.html

Reducing overhead cRTP compact RTP (RFC 2508): From 40 to 2 to 4 bytes, substantial Trunking: same packet transport more than one conversation (of course, can be used only if on a trunk)

Questions?