Caller ID is the phone number that identifies the person who is placing the call. These digits are typically transmitted at the beginning of a call, usually between the first and second ring.
While telephone companies are beginning to sell a caller ID service to residential customers, the scope of this commercially available caller ID is different from the caller ID feature available with many PBXs. The caller ID from the telephone company is often referred to as automatic number identification (ANI) and identifies callers whose numbers are assigned by the telephone company. Caller ID from within the PBX identifies callers whose telephone extensions are assigned through the PBX (referred to in this document as calling number ID).
Calling number ID from within the PBX system has powerful business applications. For example, a voice mail application may use calling number ID to let users reach individual mailboxes without having to dial extra digits. Other applications may use calling number ID for screening phone calls, allowing employees to respond to urgent calls first, as well as for automatic voice message reply, without making users redial the caller's extension. Calling number ID is useful whenever you need to know who is calling and from where they are calling.
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