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Some carriers have been known to disable payphone calls to 958 or 959 test lines, such as Bell Canada's system-wide ANAC line at (area code) 958-2580.
(One exception is Winnipeg, which reserves 959 only).
Numbers within this block are used for various test utilities such as a ringback number (to test the ringer when installing telephone sets), milliwatt 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).
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.
Late in the 20th century, caller ID and prepaid cellphone service became commonplace.
These services being more easily exploited for criminal purposes, this type of abuse of payphones faded from concern.
Automatic number announcement systems are based on automatic number identification, and meant for phone company technicians, the ANAC system works with unlisted numbers, numbers 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 identify a specific line in the system, even if CID displays every line as "line one".
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 line.Tags: Adult Dating, affair dating, sex dating