[channels]
language=fr
context=default
switchtype=euroisdn
busydetect=no 
pridialplan=unknown
prilocaldialplan=unknown
signalling=pri_cpe
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
txgain=2.2
group = 0
channel => 1-15 

echocancel=yes
echocancelwhenbridged=yes

immediate=yes
signalling=em_w
group = 1
channel => 32-36

group = 2
channel => 55