Caller ID Control
The function allows you choosing a number that you want in order to light up during the call to traditional telephones. You can also unlist the number and it won’t light up.
Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
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