| http://www.w3.org/ns/prov#value | - accessing the database to determine the identification numbers (SI1, PI1) of the first user based on the received information; in the case where the first user initiates the call, receiving a message from the second user, the message including an indication of the secret identification number (SI2) of the second user and the public identification number (PI1) of the first user, or, in the case whe
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