Privacy
There are important differences between ANI and the separate, somewhat similar, but unrelated caller ID service. A caller's telephone number and line type are captured by ANI service even if caller ID blocking is activated. The destination telephone company switching office can relay the originating telephone number to ANI delivery services subscribers. Toll-free Inward WATS number subscribers and large companies normally have access to ANI information, either instantly via installed equipment, or from a monthly billing statement. Residential subscribers can obtain access to ANI information through third party companies that charge for the service.
ANI is generally not transmitted when a call is operator assisted, only the area code of the last switch to route the call is sent.
Placing a call through an outbound-only VoIP service or some calling cards will cause a non-working number to be sent as the ANI.
Read more about this topic: Automatic Number Identification
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