span=1,1,0,ccs,hdb3
bchan=1-15
dchan=16
bchan=17-31
loadzone = us



zapata.conf:
context=from-pstn
signalling=pri_cpe
switchtype=euroisdn
usecallerid=yes
pridialplan=local
prilocaldialplan=local
nationalprefix=0
localprefix=021
busydetect=no
echocancel=yes
callerid=asreceived
echocancelwhenbridged=yes
echotraining=400
rxgain=-9
txgain=-5
group=1
channel=1-15,17-31



pri show span 1:

TMPASTSRV*CLI> pri show span 1
Primary D-channel: 16
Status: Provisioned, Up, Active
Switchtype: EuroISDN
Type: CPE
Window Length: 0/7
Sentrej: 0
SolicitFbit: 0
Retrans: 0
Busy: 0
Overlap Dial: 0
T200 Timer: 1000
T203 Timer: 10000
T305 Timer: 30000
T308 Timer: 4000
T313 Timer: 4000
N200 Counter: 3