Automated Number Announcement Circuit
Sometimes called "ANAC".
If you would like to double check the phone number
that you are using, dial 970, 114 or 211. There are different numbers
for different areas. Sometimes, the numbers are separated by the
telephone prefix that they are used in. Try these numbers and one
of them should work.
When you do dial the number, an automated voice will
come on and read back the phone number you are dialing from.