[channels]

language=en
signalling=pri_cpe        ; PRI Signalling, CPE Side
switchtype=national
pridialplan=national      ; called party number
prilocaldialplan=national ; calling party number

echocancel=64
echocancelwhenbridged=yes
rxgain=1.0
txgain=1.0

group=3
context=pri_in

channel => 1-23