VoIP Security Rating Scale

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January 17, 2005 (Network World) -- This is the rating system the tests of Cisco and Avaya systems. The overall rating was the maximum impact that the assault team could achieve.

• Secure: No perceptible disruption to voice service.


• Resistant: Only minor and/or temporary disturbance(s).


• Vulnerable: Phone service affecting many phone users could be disrupted for a protracted period, via a sophisticated or coordinated attack.


• Open: Phone service affecting most phone users could be significantly disrupted indefinitely, via a fairly straightforward assault.


• Unsecure: Phone system or service affecting all users could be readily and indefinitely disabled.

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