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10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.
The original batch of carrier codes began with 0, so this type of "dial around" service was typically marketed as dial-around 1010-xxx service. NANPA maintains separate lists of carrier codes for feature groups 'B' and 'D' [7] as not all long-distance providers support both standards. These Feature Group alternatives allowed the LEC's end users ...
Area code 700, rarely used, is reserved for carrier-specific services; each carrier places a recorded self-identification message on 1-700-555-4141 to allow a subscriber to identify the default InterLATA carrier for their line. Long-distance calls may be classified into two groups. Interstate long-distance or inter-LATA interstate long-distance ...
A local exchange carrier routes calls to 700-numbers to the interexchange carrier that the subscriber has chosen, unless the caller overrides presubscription by prefixing the destination telephone number with a carrier access code (101XXXX). The number (700) 555-4141 was established to allow subscribers to identify their long-distance service ...
When you make a long-distance call, your local carrier gives the call to a long-distance provider. That long-distance provider then covers the call most of the way before handing it off to another ...
To give telephone users the possibility of opting for a different carrier on a call-by-call basis, carrier access codes (CAC) were devised. These consist of the digits 101 followed by the four-digit CIC. The CAC is dialed as a prefix immediately before dialing a long-distance telephone number.
101-xxxx — Carrier access code for selecting an alternative long-distance carrier; xxxx is the carrier identification code (CIC). 211 — local community information or social services (in some cities) 311 — city government or non-emergency police matters
PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...