VoIP caller ID (Voice over Internet Protocol caller identification) is a caller ID application for VoIP phones that works in much the same way as caller ID on a conventional telephone line but with enhanced features and flexibility.
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When a call comes in, the caller's identity is verified by the Internet Service Provider (ISP). Users can whitelist or blacklist specific telephone numbers or entities, just as is commonly done with e-mail, so unwanted calls do not reach the user.