Telecommunications – Radiotelephone system – Including private cordless extension system
Patent
1996-09-27
1999-12-14
Cumming, William
Telecommunications
Radiotelephone system
Including private cordless extension system
H04Q 732
Patent
active
060029382
ABSTRACT:
A telephone having a speaker, microphone, processor, control unit, inhibit unit, and audible indicator. When the telephone is used to communicate conventionally with another telephone, for example to enable respective users to speak to each other, electronic signals corresponding to the speech are transmitted to and received by the telephone at an input and output, respectively. The processor electronically processes the signals. Signals from incoming calls are relayed from the input to the speaker, and signals from outgoing calls are relayed from the microphone to the output. The control unit identifies the presence of a command signal with the incoming calls. If a user of another telephone wishes to call the telephone, the user dials the number of the telephone in the conventional way. Immediately after dialing, the user has a predetermined time interval during which to input a command code vis-a-vis the key pad of his other telephone, thereby sending a command signal to the telephone which is identified by the control unit. Identification causes the inhibit unit to inhibit operation of the audible indicator, so that it is not known that the user at the other telephone is eavesdropping.
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Communications Act of 1934.
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