| http://www.w3.org/ns/prov#value | - The system may also actively inquire with other types of communication systems or networks (e.g., an instant messaging system, a wireless local area network) to determine whether a party is available or currently using a particular device or method of communication. [0053] There are many ways for the system to passively detect a change in a subscriber's status from ???unavailable??? to ???availabl
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