Caller ID (CID), also called calling line identification (CLID), is a telephone feature which provides a caller's telephone information to a called party.
Caller ID (CID), also called calling line identification (CLID), is a telephone feature which provides a caller's telephone information to a called party.
Caller ID information may not be accurate and is often spoofed.
A similar protocol is Automatic Number Identification (ANI). ANI is used by telcos for services and billing purposes. Unlike CID which is inaccurate, ANI is accurate. Unfortunately ANI is not available to subscribers and consumers.
