zaptel.conf

# Span 1: TE4/0/1 "T4XXP (PCI) Card 0 Span 1"
span=1,1,0,esf,b8zs
bchan=1-23
dchan=24

Zapata.conf

[channels]
switchtype=national
context=from-pstn
signalling=pri_cpe
group=1
channel => 1-23