The present application provides “hot desking” features for multi-device users. A number of automatic hot desking registrations are provided in which users are assigned multiple devices on a permanent basis. A private branch exchange or central switch can be provided with a list of these devices and can relieve the user of the requirement of registration by detecting use of these devices and assigning user features and other pertinent system properties e.g. as an indication of location for find me/follow me services. The extension allows for automatically hot desking using a listed device, hot desking based on a location associated with a listed device, and hot desking using declared associations of listed devices.