Asterisk has its own scripting language. Once a phone call hits Mitnick's Asterisk server, a script that he demonstrated analyzes information in the SIP header. The script can see the originating phone number and can also tell that the caller wanted their number hidden.
Manage your blocked phone numbers, contacts, and emails
But, just because you ask for something doesn't mean you'll always get it. Mitnick's script forwards all calls to his cellphone.
But, calls that requested privacy have an arbitrary three digit code pre-pended to the phone number. The net effect is that, when Mitnick's cellphone rings, he not only sees the callers' phone number, he can also tell that they tried to hide it.
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The basic issue, as I see it, is that once telephone calls become computer data, they can be manipulated like any other type of data. Caller ID can be hacked in other ways too. That is, calling from one phone number but making it appear that you called from another number.
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Mitnick briefly appeared in that story which is available on YouTube. See a summary of all my Defensive Computing postings.
Additionally, law enforcement can retrieve Private and Unknown numbers that have called your phone if your life or safety has been threatened. Many Android devices include the stock functionality to enable you to block incoming callers and phone numbers saved in your Contacts list.
The name of the call-blocking feature varies based on the manufacturer of the Android device.
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If your Android phone doesn not support call blocking by default, you can install third-party Android apps like Mr. Number tracks your blocked numbers, and you can configure the app to automatically hang up on all Private and Unknown calls, or send these calls to voicemail. The TrapCall app unveils the numbers of Private and Unknown callers just seconds after the call is received. When an unknown or blocked number calls your phone, the app sends identifying information about the number and caller, if available, to your device.
The list of blocked numbers saved on your phone displays. If you have been threatened or harassed by an unwanted caller, file a report with your local police department.
How to Block a Phone Number on Your iPhone | Tom's Guide
The law enforcement agency can then advise you regarding your options for obtaining incoming call records from your phone company, or tracing your incoming calls. Note that only a request from law enforcement or a court order can produce these types of records from your cellular provider. Based in the live music capital of the world, Tammy Columbo continues to work in the information technology industry as she has done for more than 10 years.
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