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2. Call-progress tone - Wikipedia

   en.wikipedia.org/wiki/Call-progress_tone

   The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]

3. DTMF - Wikipedia

   en.wikipedia.org/wiki/DTMF

   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]

4. Ringing tone - Wikipedia

   en.wikipedia.org/wiki/Ringing_tone

   In Japan, the standard audible ringing tone is a repeating one-second tone with a two-second pause between. The tone has a frequency of 400 ± 20 Hz, and the amplitude modulation is 15 to 20 Hz. [citation needed]

5. Ringtone - Wikipedia

   en.wikipedia.org/wiki/Ringtone

   A ringtone maker is an application that converts a user chosen song or other audio file for use as a ringtone of a mobile phone. The ringtone file is installed in the mobile phone either by direct cable connection, Bluetooth, text messaging, or e-mail. On many websites, users may create ringtones from digital music or audio.

6. Ringing (telephony) - Wikipedia

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

   Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.

7. Phantom vibration syndrome - Wikipedia

   en.wikipedia.org/wiki/Phantom_vibration_syndrome

   Phantom vibration syndrome or phantom ringing syndrome is the perception that one's mobile phone is vibrating or ringing when it is not. Other terms for this concept include ringxiety (a portmanteau of ring and anxiety), fauxcellarm (a portmanteau of "faux" /foʊ/ meaning "fake" or "false" and "cellphone" and "alarm" pronounced similarly to "false alarm") and phonetom (a portmanteau of phone ...

8. The 6 most common headache types — and when to see a doctor

   www.aol.com/6-most-common-headache-types...

   A headache is a pain in the head, neck or face that is often described as a sensation of pressure that varies in location, frequency and severity, according to the National Institutes of Health.

9. The Mosquito - Wikipedia

   en.wikipedia.org/wiki/The_Mosquito

   The sound was made into a mobile phone ringtone, which could not be heard by teachers if the phone rang during a class. [13] Mobile phone speakers are capable of producing frequencies above 20 kHz. [14] This ringtone became informally known as "Teen Buzz" [15] or "the Mosquito ringtone" and has since been sold commercially.