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Plant testing telephone numbers are carrier-specific, there is no comprehensive list of telephone numbers for ANAC services. In some communities, test numbers change relatively often. In others, a major incumbent carrier might assign a single number which provides test functions on its network
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and interoffice carrier central offices. The specifications define several test features for line conditions, such as quiet line and busy line, and test tones transmitted to callers. Telephone numbers are assigned for
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range, which is intended for communications between central offices. In some area codes, multiple additional prefixes may be reserved for test purposes. Many area codes reserved 999; 320 was also formerly reserved in
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that uses automatic equipment to announce the telephone number of the line calling in. The main purpose of this system is to allow telephone company technicians to identify the telephone line they are connected to.
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By connecting a test telephone set, a technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at the
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by speaking the telephone number of the caller, but these are not intended for use in identifying the customer's own phone number. They are used for the agent in a
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to confirm the telephone a customer is calling from, so that the customer's account information can be displayed as a "
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Most ANAC systems are provider-specific in each wire center, while others are regional or state-/province- or
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purposes. Code 959 with three or four additional digits is dedicated for access to office test lines in
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telephones to quickly identify one of multiple wire pairs in a bundle or at a termination point.
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across an entire numbering plan area, throughout an entire province or state, or system-wide.
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for ANAC facilities. Some national toll-free numbers provide
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Other carrier-specific North
American test numbers include
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