| http://www.w3.org/ns/prov#value | - The decision as to whether the remaining sending time (airtime) of the called participant calculated by the prepaid module 45 suffices to establish a connection, for example through comparison with a predefined value, can be made in the callback computer 47 or in the prepaid module 45, for example, and has to be added as corresponding function in the callback computer 47 if it is not available in
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