Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1996-05-06
1997-12-02
Matar, Ahmad F.
Telephonic communications
Call or terminal access alarm or control
At switching center
379156, 379190, 379189, 379200, 379283, H04M 166, H04M 338
Patent
active
056944616
ABSTRACT:
A method for controlling long distance calling in an analog key telephone system having a multi-frequency receiver includes the steps of: connecting the multi-frequency receiver to a telephone connected within the system; determining whether numerical digit inputs corresponding to a complete telephone number are provided from the telephone; determining whether the telephone is provided with a class of service that restricts long distance calling, when numerical digit inputs corresponding to a complete telephone number are provided; determining whether the complete telephone number represents a long distance telephone number, when the telephone is provided with the class of service that restricts long distance calling; releasing a call initiated from the telephone, when the complete telephone number represents a long distance telephone number; connecting the call initiated from the telephone, when the telephone is not provided with the class of service that restricts long distance calling, or when the complete telephone number does not represent a long distance telephone number; determining whether a predetermined time period for which the multi-frequency receiver is to be connected to the telephone between numerical digit inputs has elapsed, when numerical digit inputs corresponding to a complete telephone number are not provided from the telephone; determining whether a numerical digit key of the telephone is in a depressed state, when the predetermined time period has elapsed; and disconnecting the multi-frequency receiver from the telephone, when a numerical digit key of the telephone is not in the depressed state.
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patent: 3784757 (1974-01-01), Woolf et al.
patent: 3906365 (1975-09-01), Richardson et al.
patent: 4095056 (1978-06-01), Ewen
patent: 4096356 (1978-06-01), Burtness et al.
patent: 4096357 (1978-06-01), Mogtader
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Bushnell Esq. Robert E.
Matar Ahmad F.
Samsung Electronics Co,. Ltd.
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