/etc/zaptel.conf

LX-PBX-01:/etc # cat zaptel.conf
fxsks=1
fxsks=2
fxoks=3
fxoks=4
loadzone=us
defaultzone=us


/etc/asterisk/zapata.conf

[channels]

busydetect = 1
busycount = 7

relaxdtmf = yes
callwaiting = yes
callwaitingcallerid = no
threewaycalling = yes
transfer = yes
cancallforward = yes

usecallerid = no

echocancel = yes
echocancelwhenbridged = yes
rxgain = 0.0
txgain = 0.0

group = 1
pickupgroup = 3-4

immediate = no

context = bell

signalling = fxs_ks
;callerid = asrecieved
channel = 1

; FXO Port(TO PSTN) FXS Port(TO HANDSET)
; Set signalling FXS(PSTN) - FXO(Handset)

; AMA Flag for log clarity
amaflags = billing


; Reset group, segregate services
group = 2

; Also changing the context(Class of Service)
context = internal

; Set Signalling
signalling = fxo_ks


mailbox = 8061
callerid = "xxxxxxxxxxxxxxxx" <xxxxxxxxxxx>
channel = 3

mailbox = 8062
callerid = "xxxxxxxxxxxxxxxx" <xxxxxxxxxxxx>
channel = 4


LX-PBX-01:/etc # ztcfg -vvvv

Zaptel Configuration
======================


Channel map:

Channel 01: FXS Kewlstart (Default) (Slaves: 01)
Channel 02: FXS Kewlstart (Default) (Slaves: 02)
Channel 03: FXO Kewlstart (Default) (Slaves: 03)
Channel 04: FXO Kewlstart (Default) (Slaves: 04)

4 channels configured.

ZT_CHANCONFIG failed on channel 1: No such device or address (6)