This CS Series PBX system is an ideal telephone system for small offices and home offices. It is very easy to install and use. It has all the standard features comparable to those expensive PBX systems in the market. It works with your current analog phones and you do not need to spend extra money to buy proprietary telephones to work with the PBX. Installation is simple, no special tools, test equipment or technical skills is required. The unit has been programmed to work automatically out of the box.