On Monday 19 December 2005 11:56, you wrote: > > So the problem is, as you already stated, in analog phone. What worries > me is, that almost all analog phones I have dealt with, are causing > echo.
Yes, the 2-wire analog loop does introduce quite a bit of echo, it wouldn't if it had been perfect but there is no such a thing as a perfect analog loop :) > Interestingly enough, I also called these analog phones, from my > mobile (GSM - Nokia 6310i) and within first milliseconds I was able to > hear a bit of an echo - at least so I think. But after first ten > miliseconds or so, echo was gone. So in fact, it seems mobile operators > do apply echo cancellation, Yes, mobile and international operators do apply echo cancellation. The rule is that if you're going to introduce some delay you must be sure that no echo is running through the network. > but it seems it is not turned on, for wireline phones. There usually isn't echo cancellation between wireline phones, because the delay is so small that the echo, while present, is not annoying. It is perceived as an additional sidetone which is not harmful at all. > I already asked you, if the echo cancellation is already implemented. If > I understood you correctly, it is still not, but the structure of the > code is already prepared. Correct, and I will add it very soon, really :) Bye, -- Daniele Orlandi _______________________________________________ Visdn-hackers mailing list [email protected] https://mailman.uli.it/mailman/listinfo/visdn-hackers
