Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent
1992-07-28
1994-11-01
Chin, Stephen
Telephonic communications
With usage measurement
Call charge metering or monitoring
379132, 379155, 379 59, 379151, H04M 100, H04M 1500
Patent
active
053612973
ABSTRACT:
A method and apparatus for telephone call answer supervision, capable of detecting the completion of both national and international calls, which employ different answer confirmation formats, and provide confirmation that a placed call has been answered if least one of the following conditions occurs: 1) a tone of a given frequency, transmitted on the transmit line of a telephone, is detected as received back on the receive line; and 2) audio activity having a non-repetitive cadence is detected on both the transmit and receive lines of the telephone. Also provided is an autonomous pay telephone, such as a mobile telephone, which includes an arrangement for determining and accessing a call rate, per unit of time, for a call placed to a given telephone number, a display for displaying, in real-time as the call progresses, charges for a completed call as well as an accounting arrangement for storing charges accessed for each completed call.
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"Mitel MSAN-120 MT8880 DTMF Transceiver Applications" Jun., 1986.
Encarnacion Angel
Ortiz Luis R.
Torres Alexis
Benn Marvin N.
Chin Stephen
Gerstein Milton S.
Loomis Paul
Telular Corporation
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