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A-2 Issue 2.0 December 1995
Switch Security
The only tool a criminal needs to breach an inadequately secured system is a
touch-tone telephone. If criminals can gain access to an inside dial tone, they will
attempt to gain access to an outside line by using normal switch functions such
as:
■ Automatic Routing System (ARS) access codes
■ Pool Access Codes
Someone, somewhere, has read the switch features and administration books
and passed the information around.
1
If a criminal discovers a way to breach your
system, they will pass that information around too. They can run up thousands of
dollars of fraudulent calls in just a few hours. All security restrictions that prevent
transfer to outside lines by unauthorized persons should be implemented.
Security Tips
To help prevent toll fraud at the switch, follow these guidelines:
■ Assign toll restrictions to voice messaging system and automated
attendant ports.
■ If you do not to use the outcalling features of the voice messaging system,
restrict the outward calling capability of all voice ports.
■ Use a dial plan that does not allow extensions beginning with the same
digits as ARS, TAC, or verification and test codes.
■ Inform all system operators that they are not to dial outside calls. Request
that operators report all attempts to bypass switch restrictions to the
telecommunications department for repairs or to the corporate security
office for investigation.
■ Restrict the numbers for outcalling and AMIS with a disallowed list.
1. They already know about everything described here.