Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent
1998-08-19
2000-11-21
Nguyen, Duc
Telephonic communications
With usage measurement
Call charge metering or monitoring
379111, 379132, 379171, 379156, H04M 1500
Patent
active
061513881
ABSTRACT:
A communication charge management system includes one or more master telephone sets serving as managing telephone sets, one or more slave telephone sets serving as telephone sets managed by the master telephone sets, and a charge informing unit. The charge informing unit informs the master telephone set of the communication charge in communication of the slave telephone set.
REFERENCES:
patent: 4264956 (1981-04-01), Delaney
patent: 5222122 (1993-06-01), Hamilton et al.
patent: 5265155 (1993-11-01), Castro
patent: 5960416 (1999-09-01), Block
NEC Corporation
Nguyen Duc
LandOfFree
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