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Priority claimed from DE19742417793external-prioritypatent/DE2417793C2/de
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Publication of DD117151A6publicationCriticalpatent/DD117151A6/xx
H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal