S100U as first zaptel device

/etc/zaptel.conf:
fxoks=1

/etc/asterisk/zapata.conf
context=home
signalling=fxo_ks
group = 1
channel => 1

cat /proc/zaptel/1 output:
Span 1: WCUSB/0 "WCUSB/0 0"
1 WCUSB/0/0 FXOKS