Callback configuration for extension.conf

[a2billing]
; CallingCard application
exten => _X.,1,Answer
exten => _X.,2,Wait,2
exten => _X.,3,DeadAGI,a2billing.php
exten => _X.,4,Wait,2
exten => _X.,5,Hangup

;To standard outbound callback- used internally by callback daemon
[a2billing-callback]
; Callback application
exten => _X.,1,DeadAgi(a2billing.php|1|callback)
exten => _X.,n,Hangup

;Inbound callback scenario
; it will perform a CallerID authentication before calling back the person, not everybody is allowed to use the callback
[a2billing-cid-callback]
exten => _X.,1,Ringing()
exten => _X.,n,Set(CALLERID(num)=0${IF($[${CALLERID(num):0:1}=0]?${CALLERID(num):1}:${CALLERID(num)})})
exten => _X.,n,DeadAGI(a2billing.php|4|cid-callback) ;last parameter is the callback area code
exten => _X.,n,Hangup

;Inbound callback scenario
[a2billing-ani]
exten => 2006,1,Answer(1)
exten => 2006,2,DeadAgi(a2billing.php|3|ani)
exten => 2006,3,Hangup

What is A2billing All about

A2BILLING

THE AFFORDABLE PREPAID BILLING ENGINE

• Are you looking to get into the VoIP game but don’t know where to start?Did you know that Prepaid Billing and
• Calling Card servers could cost you upwards of USD/RM XX,XXX
• Have you looked at Open Source based solutions, but could not find any local support?