| http://www.w3.org/ns/prov#value | - The alarm may be a single audible alarm and/or may indicate to the user, for example on a display of the device, the estimated time to arrival. [0128] This arrangement has the advantage that the phone does not need to communicate anything to the Session Initiation Protocol server, and is particularly useful in urban areas, especially in a city centre where the number of users could be very high an
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