[channels]
context=default
hidecallerid=no
callwaiting=yes
usecallingpres=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
mailbox=1234
echocancel=yes
echocancelwhenbridged=yes
rxgain=0.0
txgain=0.0
callgroup=1
pickupgroup=1
immediate=no
usecallerid=no
faxdetect=no

group=1
signalling=fxo_ks
context=internal
channel => 1

group=2
echocancel=yes
signalling=fxs_ks
context=incoming
channel => 4