Maintaining / Phreaking modems lines using ANAC numbers
By Dirk Hart
Email: [email protected]
Web 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
. 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
I started dialing and soon had the whole mess documented.
Copyright September 2003 Dirk Hart All rights reserved
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