WebDual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use … WebTouch-Tone/dial pulse switch, eliminating separate Touch-Tone and rotary models Redial and Mute functions One cord to connect telephone is eliminated, base-to-handset and base-to-jack cords reinstated 1986 With the closing of the Western Electric Indianapolis Works, Trimline production is moved overseas to Singapore and China.
Telephones / Systems - Surplus & Sales
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Telephone Technology: Push Buttons and Party Lines
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