zaptel.conf

loadzone=it
defaultzone=it

span=1,1,0,esf,b8zs
bchan=1-15,17-31
dchan=16

zapata.conf

[channels]
language=it
switchtype = euroisdn

pridialplan = unknown
prilocaldialplan = unknown
nationalprefix = 0
internationalprefix = 00
usecallingpres=yes

overlapdial = no
echocancel = yes
echocancelwhenbridged = yes
echotraining = 20
immediate=no

context=incoming

group = 1
signalling = bri_cpe
channel => 1-15,17-31