[root@pbx asterisk]# cat /etc/asterisk/zaptel.conf
fxsks=1
defaultzone=us
loadzone=us

[root@pbx asterisk]# cat /etc/asterisk/zapata.conf
[channels]
signalling=fxs_ks
echocancel=yes
echocancelwhenbridged=yes
echotraining=400
callerid=asreceived
group=1
context=incoming
channel => 1