What is a withheld number?
When a number is withheld, there is no caller ID, which means the recipient cannot see who is calling. A number can be withheld during digital, analogue or voice-over-IP (VoIP) telephone calls. The process of withholding a number is also called Calling Line Identification Restriction (CLIR). The recipient of a withheld number call usually sees a message such as “unknown” or “withheld number” in their phone display instead of a phone number.


Further information

Voice over IP

Cos’è il voice over IP (voce tramite protocollo Internet - VoIP)?
Il voice over IP (voce tramite protocollo Internet - VoIP) è il metodo più comune di eseguire una chiamata telefonica tramite…

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