A telecommunications system includes a plurality of network clients (150) including a positioning controller (504) and a communications controller (502); and a positioning server (152) including a coordinating controller (161) for maintaining a database of network clients to be tracked and provide updates of position-related information to a presence server (104); wherein an associated network client is configured to transmit position information received via said positioning controller (504) to said positioning server (152) via said communications controller (502) when said associated network client is determined to be outside a predetermined range.