Australian Information Security Manual ISM-0551: IP telephony is configured such that: - IP phones authenticate themselves to the call cont

IP telephony is configured such that: - IP phones authenticate themselves to the call controller upon registration - auto-registration is disabled and only authorised devices are allowed to access the network - unauthorised devices are blocked by default - all unused and prohibited functionality is disabled.

Maintained by Gerard BlokdykVerified against the published standard 31 May 2026Control text last updated 21 May 2026

Other controls in Guidelines for communications systems

ISM-0229 Personnel are advised of the permitted sensitivity or classification of information that c
ISM-0230 Personnel are advised of security risks posed by non-secure telephone systems in areas whe
ISM-0231 When using cryptographic equipment to permit different levels of conversation for differen
ISM-0232 Telephone systems used for sensitive or classified conversations encrypt all traffic that
ISM-0233 Cordless telephone handsets and headsets are not used for sensitive or classified conversa
ISM-0235 Speakerphones are not used on telephone systems in TOP SECRET areas unless the telephone s
ISM-0236 Off-hook audio protection features are used on telephone systems in areas where background
ISM-0245 MFDs are not connected to digital telephone systems.

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