1. Alfredo Terzoli / Mosioua Tsietsi
RTMMoIP
Alfredo Terzoli / Mosioua Tsietsi

2. A conversation becomes DATA

3. And it is tranported…

4. Another view!

5. 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!)

6. ‘Vocoders’ for Videos?

7. 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?)

8. B/W consumption of a few codecs

9. VoIP bandwith calculation

10. VoIP bandwith calculation

11. Bandwidth calculators at:
(btw, the white paper distributed to you on b/w calculation comes from newport-networks)

12. 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)

13. Questions?