Patent ID: 7315746

Claim:
A telecommunications system, comprising: a plurality of network clients including a positioning controller and a 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 transmit position information received via said positioning controller to said positioning server via said communications controller, said positioning information including information related to a speed of movement; wherein said position and speed of movement information is used to derive an availability of an associated network client and said presence server is configured to transmit said availability to network clients who are registered to receive said availability; wherein said speed is correlated with a hysteresis threshold and a context to prevent a change in a context status based on momentary change in speed; and wherein a position is associated with a hysteresis threshold and a context to prevent a change in context status based on a momentary change in position; wherein said speed and said position hysteresis thresholds are correlated with hysteresis timers to begin timing when said thresholds are crossed and allowing a change in context if the speed or position are still past the thresholds when the corresponding hysteresis timer expires.