[channels]
usecallerid=yes
hidecallerid=no
callwaiting=no
threewaycalling=yes
transfer=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
faxdetect=both

signalling=fxs_ks
context=incoming-local
group=1,2
channel => 3-4

signalling=fxs_ks
context=incoming-medc
group=1,4
channel => 1-2
context=incoming-ld

switchtype=5ess
signalling=pri_cpe
group=1,3
channel => 5-27