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Dialed Number Identification Service
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<p>Dialed Number Identification Service (DNIS) is a service offered by <a href="/facts/Telecommunication/vxoj1cxR">telecommunications</a> companies to corporate clients which identifies the originally dialed <a href="/facts/Telephone_number/Px4q5qFo">telephone number</a> of an inbound call. The client may use this information for call routing to internal destinations or activation of special call handling. </p><p>For DNIS service, the <a href="/facts/Telephone_company/zvrL88NE">telephone company</a> sends a sequence of typically four to ten digits during call setup. </p><p><a href="/facts/Direct_inward_dial/jMetpsIg">Direct inward dial</a> (DID) service also provides DNIS. </p><p>For example, a company may have a different <a href="/facts/Toll-free_telephone_number/n9cLQxlh">toll-free telephone number</a> for each <a href="/facts/Product_line/CXJV5fV9">product line</a> it sells, or for multilingual <a href="/facts/Customer_support/UpmhUz0R">customer support</a>. If a <a href="/facts/Call_center/jxKon6G8">call center</a> is handling calls for multiple product lines, the corporate telephone system that receives the call analyzes the DNIS signaling and may play an appropriate recorded greeting. For <a href="/facts/Interactive_voice_response/UJvnBdL7">interactive voice response</a> (IVR) systems, DNIS is used as routing information for dispatching purposes, to determine which script or service should be activated based on the number that was dialed to reach the IVR platform. </p><p>In the United States, DNIS is commonly provided for 800- and 900-services. </p>