switchtype=euroisdn
signalling=pri_cpe

hidecallerid=no
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
echotraining=800
immediate=no
overlapdial=yes
callerid=asreceived

musiconhold=default

group=1
channel => 1-15,17-31,32-46,48-62

group=2
channel => 63-77,79-93,94-108,110-124