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2. Sprint Corporation - Wikipedia

   en.wikipedia.org/wiki/Sprint_Corporation

   A number of lawsuits between SPC and AT&T took ... Call-Net and Sprint Canada's 600,000 ... ringback tones, and ringtones. From July 2013, Sprint Music Plus ...

3. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

4. 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 tones ...

5. Special information tone - Wikipedia

   en.wikipedia.org/wiki/Special_information_tone

   Special information tone. In telephony, a special information tone (SIT) is an in-band international standard call progress tone consisting of three rising tones indicating a call has failed. It usually precedes a recorded announcement describing the problem. [1][2]

6. AT&T - Wikipedia

   en.wikipedia.org/wiki/AT&T

   AT&T Inc., an abbreviation for its former name, the American Telephone and Telegraph Company, is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. [4] It is the world's third-largest telecommunications company by revenue and the second-largest wireless carrier in the United ...

7. 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 ...