With software licenses you can unlock functions on a device, or e.g. expand support. Almost every device has an option for this. On e.g. the ARGUS testers can be used to enable functions such as an internet speed test, or on the Spectralink DECT servers more users or the use of base stations can be expanded.
At the Yeastar exchanges, you can purchase and/or extend the Cloud version or the Linkus client software. For the tiptel 8010/8020 ALL IP, licenses can be used to add more external lines or to expand functions.