Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu LtdfiledCriticalFujitsu Ltd
Priority to JP4856081ApriorityCriticalpatent/JPS57162869A/ja
Publication of JPS57162869ApublicationCriticalpatent/JPS57162869A/ja
Publication of JPH0221187B2publicationCriticalpatent/JPH0221187B2/ja
H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
H04M15/34—Charging, billing or metering arrangements for private branch exchanges
Landscapes
Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Signal Processing
(AREA)
Monitoring And Testing Of Exchanges
(AREA)
Meter Arrangements
(AREA)
JP4856081A1981-03-311981-03-31Line polarity detecting system
GrantedJPS57162869A
(en)