•Voice needs
RTT < 250ms or else listener does not know when to speak
•RTT >
400ms makes productive interactive work such as interactive telnet/X-windows style typing difficult
–Screen does
not match the keyboard, especially when correcting text
•Losses:
–Losses >
10% TCP connections fail
–Losses
>4-6% make video conferencing unintelligible for non-native language speakers
–Losses of >
3-5% make TCP perform badly
–Random loss of 2.5% will make Voice over IP annoying every 30 seconds or so
–More realistic
burst losses will cause VoIP to be annoying at >1% losses
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