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  2. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    The tone frequencies, as defined by the precise tone plan, are selected such that harmonics and intermodulation products will not cause an unreliable signal. No frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the ...

  3. Ringing (telephony) - Wikipedia

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

    In contrast to ring forward, the ringback signal is originated from the receiving or called end of a trunk line during an established connection, to recall the originating operator. [1] The signal is also sent by a coin line operator to recall a customer at a pay station after the customer hangs up, for example to inform the customer of time ...

  4. Fix problems with the AOL app on iOS

    help.aol.com/articles/fix-problems-with-the-aol...

    Verified for iOS 9.3 and later. 1. Double press the Home button or swipe up and hold. 2. Swipe up on the image of the app. 3. Re-launch the app and attempt to reproduce the issue.

  5. Ringer equivalence number - Wikipedia

    en.wikipedia.org/wiki/Ringer_equivalence_number

    The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line.In the United States, ringer equivalence was first defined by U.S. Code of Federal Regulations, Title 47, Part 68, based on the load that a standard Bell System model 500 telephone represented, and was later determined in accordance with ...

  6. Comparison of mobile operating systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mobile...

    Very limited (Does not work in background [376] and not voice controlled) 3+: Limited (Not voice controlled) [377] [378] Partial: 3rd party software [379] 3rd party software: Yes Call recorder Yes, Phone by Google, [380] but also possible with 3rd party firmware [381] Yes, integrated in the Phone app, [382] but also possible with 3rd party ...

  7. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    You may need to check any filters you've created to make sure your messages are correctly organized. Check your block settings. Make sure the option "Block All Senders Except Contacts" under "Mail Settings --> Block Senders" is unchecked. If checked, you will not receive messages from anyone not in your contacts. Learn about delivery delays

  8. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...

  9. Change ringing - Wikipedia

    en.wikipedia.org/wiki/Change_ringing

    This is not a call change 'peal', but an example of calling changes for a short period for musical effect. In call change ringing each different sequence of the bells, known as a "row", is specifically called out by one ringer, the "conductor", who instructs the other ringers how to change their bells' places from row to row. This command is ...