If you use g.711 you should expect the same quality because that is
essentially the same codec the PSTN uses in T1s.
If you use g.729 you should expect some audio degradation as it is a
lossy compression codec. You will lose quality but gain significant
bandwidth reduction
Use a high quality phone (I use Cisco 7912s), use a high quality PSTN
interface. T1 is better but a good analog FXO card should be fine.
-Matt
On May 23, 2006, at 9:04 AM, 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.
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Matthew S. Crocker
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Crocker Communications, Inc.
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