Not all the technology necessary to deliver the features of a phone system is contained within the server. A considerable amount is installed into the familiar body of a desk telephone. This is a uniquely addressable network device that constantly exchanges information with the server. It also provides the conversion from voice to IP stream. Devices are available with speed dial buttons and even video screens. If a user is particularly keen to use his existing analogue phone, an analogue phone adaptor can be fitted out of sight, to provide the required functions.