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How can I protect a telecommunication system from misuse such as unauthorised access?

April 26, 2017misuse protect system Telecommunication unauthorised

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How can I protect a telecommunication system from misuse such as unauthorised access?

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Normally a mobile phone or a fix phone can be protected against misuse with a Personal Identification Number (PIN). In a large telecommunication system (like those in companies) it is recommended to block special telephone numbers (like audiotex lines), which produces higher charges.