116:+ seven-digit number, the long-distance call is handled by a default carrier chosen by the user. Alternatively, a user dials 101 + four-digit carrier code + area code + seven-digit number, and the call is handled by the carrier specified by the carrier code. 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' as not all long-distance providers support both standards.
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destination. Largely deprecated by feature group D, but the 950 prefix and a list of carrier codes remain reserved in all North
American area codes, even in Canada where most providers went from feature group A directly to 1+ default carrier dialling and feature group D (101xxxx + destination) calling without ever using 950-XXXX as a primary means to access alternate long-distance carriers from home land lines.
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using the interexchange carrier's network, when non-stored program-controlled exchanges could not be modified to provide equal access. By the mid 1990s, Equal Access features in exchange software had rendered
Feature Group D universally available in modern landline exchanges; the others are either
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automatically; where this service is not provided or not desired (calling card applications), the 950-XXXX number must be followed by a calling card number and the long-distance destination number. If ANI is provided, calls from the one subscribed line may be made as 950-XXXX and the long-distance
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Associated with 950-XXXX calling; instead of a local telephone number the user enters 950 and 4 additional digits which identify the long-distance carrier. Operation is similar to the local access numbers (feature group A) except that the 950-XXXX access number is the same in every community,
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of a provider's gateway, followed by (usually) a password, then the desired long-distance number. There is a different local access number in each local calling area. This requires no special capability at the local telephone company office as competing long-distance providers connected using
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line is used to reach its nearest point of presence. Once the standard means of accessing alternate long-distance carriers, local access numbers are now used primarily for low-cost prepaid calling cards as the calls may be made from any phone, at flat or local
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Rare, originally used by AT&T for operator-assisted coin phones since they allow the operator to keep control of the caller's telephone line until the transaction is completed. As coin-handling for trunk calls is now automated within the phone (like a
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The current standard, requires the local switch support equal access by competing carriers at the trunk level; highest quality connection, and allows pre-selection of the
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102:, the current generation of coin phones operates self-contained without the central exchange providing coin-call support functions), group 'C' is largely obsolete.
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While there are other feature groups for local access, the four common feature groups exist for access from the local subscriber to competitive
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These
Feature Group alternatives allowed the LEC's end users to make
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The original implementation, in which a user has to dial the local
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39:. These arrangements were described in an official tariff of the
16:"950 numbers" redirects here. For the number 950, see
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Telephone World - AT&T Automated Coin Toll System
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services. They defined switching arrangements from
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used for calling card applications or are obsolete.
66:standard local lines, which may or may not support
232:NANPA list of feature group 'D' carrier codes
191:NANPA list of feature group 'B' carrier codes
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142:Complete List of NECA standard Feature Codes
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41:National Exchange Carrier Association
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255:Telephone service enhanced features
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45:Federal Communications Commission
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33:local exchange carriers
86:. Some exchanges send
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37:interexchange carriers
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88:the caller's number
35:central offices to
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218:2012-07-22 at the
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216:Archived
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47:(FCC).
75:rates.
100:COCOT
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