Angel Ramon Encarnacion

US Patent:

51346516, Jul 28, 1992

Filed:

Apr 18, 1991

Appl. No.:

7/687310

Inventors:

Luis R. Ortiz - San Juan PR
Alexis Torres - Carolina PR
Angel Encarnacion - Carolina PR

Assignee:

Codecom Rural Communications, Inc. - San Juan PR

International Classification:

H04M 1530

US Classification:

379112

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.