Importance

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Abstract

A voice call in a connectionless VoIP domain is received (2) by a protection system which resides between a CSCF system and an IP voicemail system. A filter checks (2) the originator address against personalized address white and black lists. If on the black list (3a) session set-up is terminated (3c). If (3b) it is on the white list the session is connected (4) to the recipient. If the originator address is not on the white list a local connection is established (5). Subsequently, a detector operates (6a, 6b, 6c) to prompt the originator with an audible randomly-selected question from a database containing a number of question and answer pairs, which are identified in the database by an index number (I). The questions are stored in the database in the form of audio clips, and the answers are stored in computer readable phonetic language format. The originator is requested to respond verbally to the selected question. This filters humans from machines, as only a human will have the ability to correctly interpret and answer the question. The verbal answer provided by the originator is processed (6c) by a voice recognition sub-system to generate computer readable phonetic language format. The interpreted text-based answer is matched (7) against the answer stored in the database. This addresses the problem of machine-driven voice spam

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First Claim