/etc/zaptel.conf
defaultzone=us
span=1,1,0,esf,b8zs
e&m=1-24
fxoks=25
fxsks=27-28


/etc/asterisk/zapata.conf

signalling=em_w
context=incoming
channel => 1-24

signalling=fxo_ks
echocancel=yes
echocancelwhenbridged=yes
echotraining=400
callerid=asreceived
group=1
context=default
channel => 25

signalling=fxs_ks
immediate=yes
usecallerid=no
group=2
context=incoming
channel => 27-28