The callback debit-card tcl script is a standard debitcard application with added callback feature.The application starts with ani authentication. If caller is  ani authenticated, caller will hear multiple beep tones which signals call back service is available tothe caller. Caller is expected to hangs up the phone. As soon as the callerhangs up, application calls back the caller and play welcome message which startsthe standard debitcard application process. If the caller doesn't hangs up withindefault 20 seconds which prevents GW from calling back, the call back will be cancelled.User can configure CLI parameter wait-time to replace default 20 seconds.If user is not ani authenticated, caller will be notified that the callback serviceis not available.The debitcard application allows a user to to select the lanaguage mode based onthe langauges that are configured through the CLIs.The application then prompts and collects the card number. The card number consistsof a uid and pin where uid-length and pin-length are configured through through CLIs.Authentication is done with the card number. If it passes authentication,the application plays the amount available in the user's debitcard. It thenprompts and collects the destination number.If authentication fails, the application allows user to retry and the numberof retries is configured through the CLI.Authorization is done with the destination number. If authorization issuccessful, the application plays a time duration which indicates the amount oftalk time in the user's debitcard account and places the call.If authorization fails, the application allows users to retry.------------------------------------------------------------------Script compatability matrix: app_debit_callback.2.0.0.0.tcl  IOS version compatability 12.2(11)T------------------------------------------------------------------