ModemWall - Version 1.2 Unauthorized dialers are one of the severest problems that internet users are facing today. One day, somebody can get a phone bill and can see that a lot of costly calls are made from his line without even his knowledge. This scenario is what the most of the users, ranging from home users to corporate ones, have had in the recent days. To combat with these problems, SpyWare/Adware removal prorams or sometimes anti-virus programs have been used though none provided a precise protection. Evil programs are getting more and more sophisticated. They are now even in ActiveX contents downloaded from the web. This diversity of the adversaries make the problem of detecting and preventing them more difficult. Because an unpermitted number does not have to be dialed by a known program or even by a program. Your children or workers may try to make something which may require a costly long distance call in which case no Spyware or Anti-Virus program can detect misuse. To get rid of these problems, we present a new agent ModemWall; a dialing number filtering system for Windows 2000/XP(or later) operating systems. It is the first and the only rule based number blockage tool available in the market.ModemWall cuts off the problem at the source : Prevent dialing unauthorized numbers regardless of the dialer which/who is trying to dial.