Importance

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Abstract

Modular hold circuits which may be independently connected to a telephone line and powered therefrom are provided in accordance with the teachings of the present invention. Hold circuits connectable to a telephone line in the same manner as a telephone instrument are employed to detect an actuating signal generated at any telephone instrument in an off-hook condition connected to that telephone line. Upon detection of such actuating signal, an impedance is placed across the telphone line to establish a hold condition. The hold condition established may be released by placing any telephone instrument connected to a telephone line in an off-hook condition, however, if the telephone line is provided with a 'call waiting' feature, such off-hook condition must be maintained for an interval exceeding that associated with a 'call waiting' signal for the hold condition to be released.

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First Claim