Hi!
I think all - at least all PSTN - calls have the same quality in means of
bitrate, number of channels and samplerate.
It's 8kHz, 16bit and mono.
About noise, I didn't have problems with that. Seems it's not really about
"quality". Probably it would be helpful, if you tell us, which
extensions/protocol you used.
Kindest regards
Julien
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