Mine
public text v1 · immutable[channels]
switchtype=ni1
signalling=pri_cpe
;pridialplan=local
pridialplan=unknown
;prilocaldialplan=local
prilocaldialplan=unknown
context=incoming
language=en
;echocancel=64
echocancel=yes
echotraining=no
;echocancelwhenbridged=yes
rxgain=0
txgain=0
group=1
channel => 1-23