| http://www.w3.org/ns/prov#value | - m and including a first field settable to at least a first and second deactivation state, and the step of storing said first field in the first system and, further, wherein said step of deregistering the subscriber station while deactivating said call forwarding comprises the steps of:determining whether said first field is set to said first deactivation state; and, in response to an affirmative d
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