Automatic Number Identification (ANI)
A feature that provides the phone number of the incoming caller. ANI is required with most 900 lines to identify where the call should be billed.

Dialed Number Identification Service (DNIS)
A feature that identifies the 900 number that was dialed. This allows one call center to handle a variety of calls, connecting to different support groups depending on the number dialed.

IP
Another name for an information provider, or the company that sets up a 900 number.

Tailored call coverage
The ability to selectively block calls by state or area code.