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Operation[ edit ] A technician calls the local telephone number of the automatic number announcement service. This call is connected to equipment at a local central office that uses a voice synthesizer or digital samples 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.
Automatic number announcement systems are based on automatic number identificationand meant for phone company technicians, the ANAC system works with unlisted numbersnumbers with caller ID blocking, and numbers with no outgoing calls allowed. Installers of multi-line business services where outgoing calls from all lines display the company's main number on call display can use ANAC to Mci case a specific line in the system, even if CID displays every line as "line one".
One exception is Winnipegwhich reserves only. Numbers within this block are used for various test utilities such as a ringback number to test the ringer when installing telephone setsmilliwatt tone a number simply answers with a continuous test tone and a loop around which connects a call to another inbound call to the same or another test number.
ANAC numbers can also appear in the range, but there is no requirement that they reside there.
In some area codes, multiple additional prefixes had been reserved for test purposes, in addition to the standard and Many area codes reserved ; was also formerly reserved in Bell Canada territory.
As widespread inefficiencies in numbering such as the assignment of entire blocks of numbers to every competing carrier in every small village to support local number portability schemes have created shortages of available numbers, these prefixes are often "reclaimed" and issued as standard exchanges, moving the handful of numbers in them to one standard test exchange usually Some carriers have been known to disable payphone calls to or test lines, such as Bell Canada's system-wide ANAC line at area code Conversely, a standard line on which voice service has been unsubscribed such as an ADSL dry loop may still accept calls to the test exchange but not allow calls to standard numbers.
This "soft disconnect" condition is intended to allow calls to emergency services and to the telco business office to order telephone service, but to no other numbers.
Tollfree numbers[ edit ] Some large telephone companies have toll-free numbers set up. This is distinct from technical support and other lines which use ANI so that a computer can automatically display the customer's account on a " screen pop " for the next available customer service representative: Formerly, some companies changed their ANAC number every month for secrecy; this is still the case with a few numbers.
In one example of this concern, most payphones in the United States are assigned a telephone number and can ring if the number is called. The phone can then be used to make and receive calls by anyone, making it a potential tool in anonymous criminal activity such as narcotics trafficking.
Late in the 20th century, after caller ID and pre-paid cell phone service became commonplace and with these services being more easily exploited for criminal purposes, especially in the case of burner phones, this type of abuse of payphones faded from concern. In Canada, this behaviour has always been more difficult.
As a matter of course, incoming calls to payphones are disabled; furthermore, the Bell ANAC number is also disabled although the telephone number is marked on the payphone itself as it is needed to report a non-working coin phone to repair service.
There are some private national toll-free numbers that use ANI and then have a computer read back the number that is calling, but these are not intended for use in identifying the customer's own phone number. They are used in order for the agent in the call center to confirm the phone the customer is calling from, so that a computer can automatically display the customer's account on a " screen pop " for the next available customer service representative; they are distinct from purpose-made toll-free ANAC numbers.
Regardless, if one were to call one of these numbers, listen for the number confirmation and hang up, they would in effect be using this system as if it were an ANAC.
One such toll-free service is one owned by MCI - This number US only is easy to remember and, when called, will read back the number after a very short message. ANAC numbers[ edit ] This section needs to be updated.
Please update this article to reflect recent events or newly available information. December These numbers appear on various lists circulated on-line, many from the s and s. Most were published years ago by PhrackMagazinethe alt. The information is not reliable, as numbers change often. Many of the listed numbers no longer work.
The list is presented by area code, number and location. In some regions, there are several numbers, depending on the telephone company or the area code of the caller, as there can be several central offices serving some areas.
Frequently, a prefix outside the or range such as,was also listed as a test exchange, only to be reclaimed and issued as a block of standard numbers at a later date. NANPA's utilised codes report will indicate 'UA' unassignable for valid test prefixes; if a formerly 'UA' code newly appears on the available list or becomes an active exchange, any former test numbers from its time as a reserved prefix are presumed invalid and deprecated.
N11 prefixes such asand are also disappearing as test numbers as these codes are reassigned to local services such as city, community or highway information.
Some area codes will flag additional codes as 'UA' or unassignable, in some cases reserving them for test numbers. A few commonly-used or numbers for major incumbent landline carriers:Studio Maintenance: specializing in analogue equipment since Repairs, Parts and Service.
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Parts for Ampex and Otari tape recorders. An automatic number announcement circuit (ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a srmvision.com facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's telephone number.
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