On my Asterisk installation, I've had to roll back to Zaptel 1.2.19.
When I use 1.2.20, I get very bad echo problems.
It seems to work OK if I use a quieter-than-normal speaking voice, but
at a sufficient sound level, the echo "breaks through" and then never
goes away.
The problem goes away if I revert to 1.2.19.
Hardware in question: Digium TE110P, Adtran TA750 channel bank, Adtran
1175407L2 FXO card. The phone was on a TDM400P FXS port.
Is there something else I need to tweak in 1.2.20?
Russ
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