Australian Information Security Manual ISM-0236: Off-hook audio protection features are used on telephone systems in areas where background

Off-hook audio protection features are used on telephone systems in areas where background conversations may exceed the sensitivity or classification that the telephone system is authorised for communicating.

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-0245 MFDs are not connected to digital telephone systems.
ISM-0546 When video conferencing or IP telephony traffic passes through a gateway containing a fire

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