[Asterisk-Users] Static on ZAP channels

[Tim Jackson]

I have a TDM2400P with hardware echo cancel.  We seem to have static on
some calls but not others and the receive audio appears 'choppy'. 
Transmit side works fine and does not have any audio problems.  I had to
turn up the RX gain to 18 or the receive audio volume is too low.

Can anyone shed some light?

Thanks.

TJ