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Using selective call forwarding on an AT&T POTS line I stumbled across a CAC I have little understanding of or of it's purpose. Thought Phreaker was able to reproduce this revealing the same CAC using this method. Using the selective call forwarding service feature (*63) when selecting the destination number calls are to be forwarded to, entering 00 plus any digit(s) and '#' Will cause the the system to read back a the CAC "10190170+xx" following the CAC are the digits you entered with leading '0'truncated. For example You were to enter "004" as the number you want your calls forwarded to. You'd hear it read back "The number you entered 1019017004 is not permitted." Removing the extra two digits in this example and and using 1019010 as a CAC you are able to dial local non toll numbers you normally could not dial using a CAC including X11 number "0" operator and normal 7 digit numbers. Entering '#' after the CAC gives you a dial-tone you can dial off of. What purpose it serves I have no clue. Thought Phreaker is at somewhat of a loss but hopefully he'll chime in with his thoughts. It's likely specific to AT&T but we've had no other way to try this anyplace other than our AT&T POTS lines. Would love to hear from anyone with a different carrier and what if anything they were able to get back by trying this out.