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The system basically intercepts all calls. If it recognises them as a friend or a member of the user's family - numbers on the so-called star list created by the user - it lets them through as normal.If the caller's number is on a zap list - numbers of telemarketers or other nuisance callers - the device answers it, and all future calls from that number, with an automated message which means the phone does not ring at all.
If the system doesn't recognise the caller's number, or the caller withholds their number, it asks them who they are, puts them on hold and then rings the user's phone.
The user has the option of taking the call, having the system take a message, or they can reject the call and add the number to the "zap" list.
