The purchase of Swyx does not include the operating system software required for installation and operation. Since Swyx is based on Microsoft Windows operating systems, you must have licenses for the computers on which you want to install Swyx components. Appropriate licenses are needed in order to use a telephony Client.

In addition to the operating system licenses, so-called "Client Access Licenses" (CALs) from Microsoft for Windows server systems may be required.

For further information on the current licensing conditions for Microsoft WindowsServers, and access to services provided by such a server, please see the license agreements for these products and the Microsoft publications.