yes there are 3 dialplans I beleive work for this.
[a2billing-callback] exten => _X.,1,deadAGI(a2billing.php|1|callback) exten => _X.,n,Hangup
[a2billing-cid-callback] exten => _X.,1,deadAGI(a2billing.php|1|cid-callback|34) ;last parameter is the callback area code exten => _X.,n,Hangup
[a2billing-all-callback] exten => _X.,1,deadAGI(a2billing.php|1|all-callback|34) ;last parameter is the callback area code exten => _X.,n,Hangup
** But a simple solution would to create a call back in Free PBX and then route a toll free DID to an announcement that go to the callback destination after playback.
Then set up your callback function to goto the A2billing dialplan that asks for the callers PIN number, as if they called into your local access number(s).
Using Toll Free DID's with Vitelity I have found is the same price as a local DID per minute, also using Toll Free numbers when the caller calls your system no matter what privacy settings the phone has setup using a Toll Free number the privacy information is always stripped. (USA only I'm sure)
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