Security system for terminating fraudulent telephone calls
Security system using call display
Security system with audible link two-way communication
Security system with two signal reporting
Selecting flip phone operating mode using flip position
Selecting keyboard unit, particularly for telephone systems
Selection of a link in a received message for speaking...
Selection of communications for service observing based on...
Selection of terminal equipment in response to a data...
Selection system with keypad control
Selective call reject feature for a telephone
Selective call transfer to a cellular and/or cordless radio...
Selective call waiting disable service feature for analog...
Selective caller id blocking
Selective filtering of incoming telephone calls
Selective ringing circuit for a telephone
Selective screening of incoming calls for cellular telephone...
Selective signalling apparatus with storage of call signals
Self adjusting bias power supply for line powered telephones
Self calibration arrangement for a voice switched speakerphone