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When the carrier passes calls to the automatic call distributors, the dialed number identification service is also passed along so that the automatic call distributor can use this information to route calls. DNIS works by passing on the touch tone digits the caller punches in to a special facility that can read them, display them or incorporate them into call center programming
The dialed number identification ranges from four to 10 digits in length. If a call center is handling calls for multiple product lines, for example, the switch receiving the calls can examine dialed number identification and respond accordingly.