Telephone CAPTCHA determines if a computer or human is calling. When a call is placed, the caller is asked a question. In order to complete the call and ring the destination, the answer needs to be correct. Features can include voice recognition so the answer can be spoken or using the telephone keypad. Example: What is 1 + 2? The caller can say 3 or hit 3 on the keypad. Then the call will be completed to the called number.
Telephone CAPTCHA can be done on the destination numbers telephone switch or on a 3rd party telephone switch. The 3rd party telephone switch method requires the destination number be forwarded to the 3rd party switch. The 3rd party switch would then forward the call to a configured destination after the caller answers a question correctly.
Other possible features include:
A user could have a phonebook on the CAPTCHA telephone switch that when a called number matches an entry in the phonebook, the number is immediately forwarded without performing telephone CAPTCHA. A cellular phone application can also be used to determine if CAPTCHA is necessary based on a match in the cell phones phonebook.
A setting could be enabled that when a caller successfully answers a CAPTCHA question correctly, the caller will be placed in the phonebook or database. This way the caller doesn't have to do telephone CAPTCHA again when calling that number.
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