Alberta Termination Test Line
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Alberta Termination Test Lines are a rare type of test line that was used during the Telus area code split in Alberta (403 to 780 for North, 403 for South). The numbers will terminate at a recording, allowing one to leave a message, and were used to test call routing in the new area code and to keep line technicians in communication.
A large amount of these existed at one time in the 780 area code, but now many have been removed. They were toll-free from all areas during a period of 1999.