Apparatus and method for displaying duration of a call made over

Details Apparatus and method for displaying duration of a call made over Apparatus and method for displaying duration of a call made over

1989-09-08

1991-12-31

Teska, Kevin J.

Boots, shoes, and leggings

368 4, 36446401, 379131, 379140, G06F 1520, H04M 1528

Patent

active

050776827

ABSTRACT:
A method and apparatus for displaying duration of a call that is made over a central office line. The keyphone system having a plurality of keyphone subsets with displaying devices, for carrying out the invention, includes the steps of: notifying call-start by activating a call-duration start timer, if the call over the central office line is started, or, if not, checking whether or not the call is ended; checking whether or not the call-duration display is held, if the call is ended in the above step; checking sequentially whether or not a signal for activating call-duration start timer or call-duration increment timer are activated, if the call is not ended and a time key is not pressed; checking whether or not the central office line is held, if the signal for activating the call-duration start timer or call-duration increment timer is activated, and, if not held, sending call-duration data to a calling keyphone; and clearing a display of the call-duration and displaying a current time, if the time key is pressed and call-duration display is held in the checking step of the signal for activating call-duration start timer or call-duration increment timer.

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"Telephone Timer"; Funkschall, vol. 47, No. 25 (12/75), pp. 89-90.

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