Patent ID: 8811248

Claim:
A method to extend battery life of a mobile device in a wireless network by means of retaining the device in power saving mode until pre-configured wake-up conditions, which are set prior to the device entering its power saving mode, are met, comprising the steps of: registering the mobile device to a sleep server to discontinue the mobile device waking-up periodically to verify the network packets; registering the Sleep Server to a Session Initiation Protocol server and Call Filtering Server to allow the Sleep Server to be contacted when a caller attempts to communicate with the mobile device; sending Session Initiation Protocol message from caller to Call Filtering Server to forward the said message to the mobile device; verifying the Session Initiation Protocol message from caller to determine if the message meets the pre-defined wake-up conditions; and forwarding the Session Initiation Protocol message from caller to mobile device to wake-up the mobile device.