By Jason Morris There are three major types of phone system available: KSU-Less phones, Key systems and Private Branch Exchange (PBX) systems. Which type of phone system you choose will depend on the amount of extensions you require and the features your telephone system needs to have installed. KSU-Less systems KSU-Less systems are usually more suited to companies that typically have less than ten employees, or require less than ten extensions. That isn't to say that all companies requiring less than ten phone extensions can make do with a KSU-Less system. It may be that you require more features which are only available through either a PBX or Key phone system. Requiring a far lower initial investment than the other types of business phone systems, KSU-Less phones are specifically designed to include many of the features usually only available through the implementation of a full small business phone system. KSU-Less systems can be easily unplugged and relocated, becaus