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The co-founder of the Metasploit Project aims to upgrade wardialers this week, speeding surveys of blocks of phone numbers using voice-over-IP lines and storing data on who — or what — answers the phone at each number.
Article :

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
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svn co