“WarVOX is a suite of tools for exploring, classifying, and auditing
telephone systems. Unlike normal wardialing tools, WarVOX works with the actual audio from each call and does not use a modem
directly. This model allows WarVOX to find and classify a wide range of interesting lines, including modems, faxes, voice mail boxes, PBXs, loops, dial tones, IVRs, and forwarders. WarVOX provides the unique ability to classify all telephone lines in a given range, not just those connected to modems, allowing for a comprehensive audit of a telephone system.

WarVOX requires no telephony hardware and is massively scalable by
leveraging Internet-based VoIP providers. A single instance of WarVOX on a residential broadband connection
, with a typical VoIP account, can scan over 1,000 numbers per hour.

WarVOX is designed to run on modern Linux systems, specifically Ubuntu 8.10 and BackTrack 4.

Download :
http://warvox.org/install.html