[Asterisk-Users] can't make my PRI dial out

[Mark Phillips]

I have a full PRI installed on my * machine. I can get inbound calls 
just fine but can't make outbound ones.

Zaptel.conf says;

span=1,1,0,esf,b8zs
bchan=1-23
dchan=24


zapata.conf says

language=en
context=default
switchtype=4ess
pridialplan=unknown
signalling=pri_cpe
channel=>1-23
echocancel=yes
group=1

dial string in extensions.conf says

; calls to the outside world via the PSTN
exten => _81NXXNXXXXXX,1,Dial(ZAP/1/${EXTEN:1})

When I try to dial a number I get

- Executing Dial("SIP/3710-23ea", "ZAP/17327356701") in new stack
Apr 22 10:19:17 NOTICE[28197]: app_dial.c:803 dial_exec: Unable to 
create channel of type 'ZAP' (cause 0)
   == Everyone is busy/congested at this time

pri show span 1 says

120b-pbx*CLI> pri show span 1
Primary D-channel: 24
Status: Provisioned, Up, Active
Switchtype: AT&T 4ESS
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

Paid support from Digium sucks royally. They don't even know what their 
own error codes mean!!

Any ideas?

Thanks

Mark