Patent ID: 7606577

Claim:
A telecommunications system, comprising: a plurality of network clients including a positioning controller and a radio data network communications controller; and a positioning server including a coordinating controller for maintaining a database of network clients to be tracked and provide updates of position-related information to a presence server; wherein said plurality of network clients are configured to maintain one or more position-presence rules; wherein said plurality of network clients are configured to transmit position information received via said positioning controller to said positioning server via said radio data network communications controller when a presence change indicated by the position-related information is detected and responsive to the plurality of network clients detecting a change in position and presence in accordance with the one or more position-presence rules, wherein the change in presence and position is associated with a hysteresis; and wherein said presence server is configured to transmit to said plurality of network clients a plurality of availability information defining where said plurality of network clients may be contacted correlated with said position information, said availability information defining parameters within location boundaries of a plurality of contact media.