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.
You can download it from the following link: https://packetstormsecurity.com/files/download/75472/warvox-1.0.0.tar.gz
Source: https://packetstormsecurity.com/files/75472/WarVOX-Telephony-Auditing-Tool.html