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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)

    A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook.

  4. 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 ...

  5. 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.

  6. Call changes - Wikipedia

    en.wikipedia.org/wiki/Call_changes

    Call change ringing is a branch of the art of change ringing, in which a group of English-style full-circle bell ringers are instructed continually to create different sequences, or changes, of the bells' striking order. Each command from the leader or "conductor" of the ringing results in a new sequence of sounding the bells.

  7. 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 ...

  8. North American Guild of Change Ringers - Wikipedia

    en.wikipedia.org/wiki/North_American_Guild_of...

    The North American Guild of Change Ringers (NAGCR) was founded in 1972 after the hanging of a ring of bells in the Washington National Cathedral in Washington, D.C., United States, in 1964. The NAGCR has now grown and expanded to 52 bell towers across the United States (44 towers) and Canada (8 towers) as well as one mini-ring and 9 hand-bell ...

  9. Fix problems reading or receiving AOL Mail

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

    If you find emails in your Spam folder that don't belong there, you'll need to mark the messages as "not spam." 1. Sign in to AOL Mail. 2. Click the Spam folder. 3. Select the message that isn't spam. 4. At the top of the page, click Not Spam.