A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are not in the same vicinity of each other to be heard directly.

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Is there any way to detect caller ID spoofing?

To be specific the main problem is that I want to detect if the caller ID of the incoming cal I get is real or spoofed? Most VoIP servers now allow their clients to use any caller ID they want. Also, ...