Maintaining / Phreaking modems lines using ANAC numbersWeb Site: MailStarUSA.com
I walked into a pile of modems today. Although acessing servers using modems is more secure than telnet they are still holdovers from yesteryear. Nonetheless, my client had one modem for outbound FAX from the server, two more for inbound connections, and one for an unused outbound connection. Somehow, as the years drifted by, we lost track of which modems were for inbound connections and which were outbound. The wires went to jacks on the wall, but these were unmarked. How was I to know what the telephone number was that connected to each modem?
I remembered that I talked to one lineman who had a number he called and an electronic voice would repeat back the telephone number that he had called from. After twenty minutes of googling I found that what I wanted was called an ANAC (Automatic Number Announcement Circuit) number. After a bit more googling I found ttp://text.staticfree.info/anac.txt . The ANAC numbers are also given in http://www.cs.uu.nl/wais/html/na-dir/alt-2600/faq/.html , a very rich collection of information.
I started dialing and soon had the whole mess documented.Copyright September 2003 Dirk Hart All rights reserved
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