Mine

channels]
context=incoming
switchtype=national
signalling=fxs_ks
rxwink=300              ; Atlas seems to use long (250ms) winks
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=800
rxgain=0
txgain=0
group=2
callgroup=1
pickupgroup=1
immediate=no


signalling=fxs_ks
context=incoming
group=2
relaxdtmf=yes
;channel => 1-8
channel => 1-5