Dialed Number Identification Service (DNIS) is a service sold by telecommunications companies to corporate clients that lets them determine which toll-free number was dialed by a customer. This is useful in determining how to answer an inbound call.
For example, a company may have a different toll free number for each product line it sells. If a call center is handling calls for multiple product lines, the switch that receives the call can examine the DNIS, then play the appropriate recorded greeting.
Another example of multiple toll free numbers might be used for multi-lingual identification. A dedicated toll free number might be set up for Spanish speaking customers.
