If you want to implement Pin-less Calling card solution using A2billing and Asterisk, follow the steps:
System Settings–>Global Lists –> Display All — > Search for “CID” –> change the “Enable CID” settings to Yes
|CLID Enable||cid_enable||Yes||enable the callerid authentication if this option is active the CC system will check the CID of caller .|
Now add a new caller ID from CUSTOMERS–>Caller ID also select a ID card you have created before:
Now if you call to your DID, you should automatically responded by A2billing about your balance. It will not ask for PIN number.