hi tropical,
my search for 'audiocodes' box topics
returned one of your reply, (replied with a request there
so i browsed on some of your previous posts.
I was just reading "The asterisk handbook version 2"
and on page 52 there is a mention of rxgain and txgain
options in zapata.conf
I don't know if its applicable to your problem but it says there:
Adjust receive/transmit of incoming/outgoing volume to compensate
for hardware differences.
HTH