best effort has problems
swmike at swm.pp.se
Sat May 29 19:35:25 UTC 2004
On Sat, 29 May 2004, Edward B. Dreger wrote:
> Nitpicking: Latency isn't that important with unidirectional
> communication. However, VoIP users seem reasonably happy with
> current latency and jitter -- and the Internet still is _largely_
> xxTP, anyway... particularly if one ignores peer-to-peer file-
> swapping programs.
Latency is fine for VOIP as long as you dont interact with the PSTN
network, if you want to interact with PSTN then you need echo
cancellation if you have high latency on the IP part.
Most VOIP applications can handle 40ms jitter, so that's normally no
problem unless your local access is full. Packet loss is normally no
problem for VOIP if you use a proper (non-telco developed) codec.
VOIP is actually better off with high packet loss and low jitter than the
other way around (throwing off the old truth that core equipment should
have lots of buffers).
Mikael Abrahamsson email: swmike at swm.pp.se
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