from /etc/asterisk/zapata.conf

group = 1
callgroup = 1
pickupgroup = 1
signalling = pri_cpe
channel => 1-15,17-31

from /etc/zaptel.conf

span=1,1,0,ccs,hdb3,crc4
span=2,0,0,ccs,hdb3,crc4
span=3,0,0,ccs,hdb3,crc4
span=4,0,0,ccs,hdb3,crc4
bchan=1-15,17-46,48-77,79-108,110-124
dchan=16,47,78,109