Mine!

[channels]
;
musichold=default
context=incoming
switchtype=dms100
signalling=pri_cpe
group=1
channel => 1-22
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
transfer=yes
cancallforward=yes
callreturn=yes
;
; Echo Cleaning Attempts
;
;
rxgain=-5.5
txgain=5.5
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes