[trunkgroups]

[channels]
context=sip-internal
switchtype=national
pridialplan=national
prilocaldialplan=national
priindication=outofband
signalling=pri_cpe
channel => 1-23

usecallerid=yes
hidecallerid=no
callwaiting=yes
restrictcid=no
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=no
echocancelwhenbridged=yes
rxgain=0.0
txgain=0.0
group=1
callgroup=1
pickupgroup=1

immediate=no
callerid=asreceived