Dialed Number Identification Service. A feature of 800 and 900 lines that provides the number the caller dialed. DNIS allows one trunk group to service multiple applications, thus requiring fewer phone lines. For example, you could give one 800 number to callers in New York, one to callers in Chicago, and one to callers in LA. With DNIS, one trunk could be used to answer all those calls, playing a different, customized recording for each number called.


C21 Communications provides solutions and products designed to reduce the cost of telephony for SoHo and SME businesses, right through to global enterprises.

C21 Communications Ltd. Harwell International Business Centre, 173 Curie Avenue, Harwell, Didcot, Oxfordshire, OX11 0QG.


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