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2. Telephone keypad - Wikipedia

   en.wikipedia.org/wiki/Telephone_keypad

   A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this ...

3. Dialling (telephony) - Wikipedia

   en.wikipedia.org/wiki/Dialling_(telephony)

   The touch tone key pad has sixteen keys laid out in a four-by-four matrix. Each key produces a combination of two audible tone frequencies, determined by their position on the pad. Each column and row has a distinct frequency assigned, thus generating a total of sixteen dual-tone multi-frequency (DTMF) signals. Early keypads only used the keys ...

4. Vertical service code - Wikipedia

   en.wikipedia.org/wiki/Vertical_service_code

   A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated with ...

5. Download, install, or uninstall AOL Dialer - AOL Help

   help.aol.com/articles/aol-dialer-download-and...

   Download, install, or uninstall AOL Dialer - AOL Help. AOL APP. News / Email / Weather / Video. GET. Mail. Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more.

6. Add access phone numbers to AOL Dialer

   help.aol.com/articles/manually-add-access-phone...

   Connect an access number to AOL Dialer. 1. Click Connection Settings from the mail AOL Dialer page and follow the prompts. 2. Enter your location and connection type and click Next. 3. Select your dialing options and click Next. 4. Enter your area code and click Next.

7. AOL Dialer - AOL Help

   help.aol.com/products/aol-dialer

   Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more.

8. DTMF - Wikipedia

   en.wikipedia.org/wiki/DTMF

   www.itu.int /rec /T-REC-Q.23 /en. Dual-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. [ 1 ] DTMF was first developed in the Bell System in the United States, and became known ...

9. Push-button telephone - Wikipedia

   en.wikipedia.org/wiki/Push-button_telephone

   A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...