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2. Ringing tone - Wikipedia

   en.wikipedia.org/wiki/Ringing_tone

   Also known as caller tunes in some countries, such as India, [6] [better source needed] ringback music is a service offered by mobile network operators to permit subscribers to select music or even install personalized recorded sounds for audible ringing.

3. Call-progress tone - Wikipedia

   en.wikipedia.org/wiki/Call-progress_tone

   Call-progress tone. In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party . Telecommunication equipment such as fax machines and modems are designed to recognize certain ...

4. Boost Mobile (United States) - Wikipedia

   en.wikipedia.org/wiki/Boost_Mobile_(United_States)

   A Manhattan mobile phone store offered products and services from several Sprint-owned prepaid brands, including Boost Mobile.

5. Dial tone - Wikipedia

   en.wikipedia.org/wiki/Dial_tone

   Dial tone. A dial tone ( dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed ...

6. Boost Mobile (Australia) - Wikipedia

   en.wikipedia.org/wiki/Boost_Mobile_(Australia)

   Boost Mobile was founded by Peter Adderton in Sydney, Australia in 2000. [1] Optus began licensing the Boost Mobile brand that same year. [2] In 2012, Optus ended its business relationship with Boost; [2] [3] they subsequently switched resell access to the Telstra network, [3] with Telstra reportedly "looking to chase the youth market". [4]

7. DTMF - Wikipedia

   en.wikipedia.org/wiki/Dtmf

   The red keys in the fourth column produce the A, B, C, and D DTMF events. 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 ...