Derek Lee-Wo wrote:
Get an FXO card with hardware echo cancellation. I use the Sangoma
A20002D (four FXO ports with echo cancellation). It definitely costs
more, but the hardware echo cancellation makes a huge difference in call
quality! Software echo cancellation doesn't really work...
With this card, would you say your audio quality is identical to that
of an analog phone connected directly to the PSTN? I'm trying to
understand if I should expect "some" audio degradation when going
through Asterisk.
Everything causes degredation. Yes the card is a codec so it will not
be "perfect".
Many modern telephones are also codecs. The question you're trying to
ask is is this
degradation noticeable? The answer to that is obviously no. There is
an application out
there that might benefit you in a situation like this. Go look through
your zaptel source
tree for "fxotune" and see if it cant possibly correct some of the
problem you're having.
After you've tried that I'd suggest posting a .wav file of exactly what
you're hearing (there are
recording functions in asterisk) and maybe someone that's heard the
degredation you're hearing
before will reply.
Andrew
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