[trunkgroups]
spanmap => 4,1,1

[channels]

switchtype=national
signalling=pri_cpe
pridialplan=unknown
prilocaldialplan=unknown
usecallerid=yes
callerid=asreceived
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
rxgain=0.0
txgain=0.0
relaxdtmf=yes
musiconhold=native
language=en
context=local-inbound

group = 1
channel => 1-23
channel => 25-47