vitto:/etc/asterisk# fxotune -d -b 1
Dumping module /dev/dahdi/1
echo ratio = 0.1791 (816.1 / 4557.0)
Done!

vitto:/etc/asterisk# cat /etc/dahdi/system.conf
fxsks=1
echocanceller=oslec,1
# channel 2, WCTDM/0/1, no module.
# channel 3, WCTDM/0/2, no module.
fxoks=4
echocanceller=oslec,4

# Global data

loadzone	= es
defaultzone	= es