Patent ID: 8320365

Claim:
A system comprising: a presence server configured to: receive first presence-based information from a plurality of devices, the first presence-based information indicating presence statuses of the plurality of devices, receive second presence-based information from an originating mobile device over a wireless network, the second presence-based information indicating a presence status of the mobile device, transmit the first presence-based information to an originating mobile device over a wireless network, and transmit the second presence-based information to the plurality of devices, and a telephony network subsystem communicatively coupled to the presence server and configured to receive a trigger indicating a change in usage status of the mobile device and to send a message to the presence server indicating the change in usage status, wherein the presence server is further configured to transmit third presence-based information to the plurality of devices, the third presence-based information indicating an updated presence status of the mobile device based on the change in usage status.