/etc/zaptel.conf:

span=1,1,0,cas,hdb3
span=2,1,0,cas,hdb3
span=3,1,0,cas,hdb3
span=4,1,0,cas,hdb3

loadzone=nl
defaultzone=nl


bchan=1-15
dchan=16
bchan=17-31
bchan=32-46
dchan=47
bchan=48-62
bchan=63-77
dchan=78
bchan=79-93
bchan=94-108
dchan=109
bchan=110-124

/etc/asterisk/zapata.conf:

[channels]
language=en
context=outbound
switchtype=euroisdn
signalling=pri_net
usecallerid=yes
hidecallerid=no
callwaiting=no
callwaitingcallerid=no
threewaycalling=no
transfer=no
cancallforward=no
callreturn=no
echocancel=yes
echocancelwhenbridged=yes

rxgain=0.0
txgain=0.0

group=1

immediate=no
amaflags=billing
accountcode=curacao

channel => 1-15
channel => 17-31
channel => 32-46
channel => 48-62
channel => 63-77
channel => 79-93
channel => 94-108
channel => 110-124

/etc/asterisk/extensions.conf (dial bit):

[inbound]
exten => _X.,1,Dial(ZAP/g1/${EXTEN}|120)

error message im getting as a result of calling into it:

    -- Accepting AUTHENTICATED call from 62.223.245.55, requested format = 4, actual format = 4
    -- Executing Dial("IAX2[curacao_trunk1@62.223.245.55:4569]/1", "ZAP/g1/4338822|120") in new stack
Aug 30 14:36:54 NOTICE[311315]: app_dial.c:689 dial_exec: Unable to create channel of type 'ZAP'
  == Everyone is busy/congested at this time
    -- Hungup 'IAX2[curacao_trunk1@62.223.245.55:4569]/1'