Patent ID: 8375426

Claim:
A method of handling a request for presence data of an observed client, as executed in a presence server that provides presence data of the observed client to authorized watching clients, wherein a subscription request has been received from the observed client for notifications on any unauthorized attempts to get presence data, the method comprising the steps of: receiving from an initially unauthorized watching client, an expanded Session Initiation Protocol (SIP) SUBSCRIBE message containing a request for presence data of the observed client, the expanded SIP SUBSCRIBE message including additional information that has been created or selected by the watching client to identify the watching client more completely than a standard SIP SUBSCRIBE message; detecting that the watching client is unauthorized; extracting the additional information from the expanded SIP SUBSCRIBE message after detecting that the watching client is unauthorized; and sending an expanded SIP NOTIFY message to the observed client notifying the observed client of the unauthorized attempt of the watching client to get presence data, the expanded SIP NOTIFY message containing the extracted additional information, thereby increasing the chance that a user of the observed client will approve the request for presence data.