On Fri, 2 Sep 2005, Russell McMahon wrote:

> Far end echo is not closely correlated with loop time. FEE is due to 
> hyvrid mismatch at a 2w/4w point. Long delay calls are indeed very 
> hard on 'normal' phone conversations. I have had what I think was a 3 
> satellite link at one stage and an awareness at both ends of what's 
> happening and total discipline is needed for a reasonable information 
> exchange.

There is no hybrid in voip/voip connections. The echo is due to earphone 
audio getting into the microphone (with or without room echo and 
reverberation). The correspondents very often use computers as 
speakerphones (without the speakerphone mutex circuit).

Peter
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