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) configured to receive position information from said positioning controller (504); wherein said positioning server includes...http://www.google.es/patents/US7885665?utm_source=gb-gplus-sharePatente US7885665 - System and method for failsafe presence monitoring
System and method for failsafe presence monitoring
