Dialed Number Identification Service (DNIS) tells the receiving system which number a caller dialed, not who is calling.
- DNIS (Dialed Number Identification Service) identifies which number a caller dialed to reach you, the opposite of what ANI captures.
- DNIS is especially useful when several numbers all ring into one system, so the receiving side knows which line the call actually came in on.
- DID service is what makes DNIS possible in the first place: the carrier has to track the dialed number before it can pass it along.
What Is DNIS (Dialed Number Identification Service)?
Dialed Number Identification Service (DNIS) is a carrier feature that tells the receiving system which number a caller dialed to reach it, rather than who is calling. It answers the opposite question from ANI (Automatic Number Identification), which identifies the caller instead. For the basics of how a fax number gets dialed and connected in the first place, DNIS builds on that same call setup process.
Why DNIS Matters When Several Numbers Share One System
DNIS becomes useful the moment more than one number rings into the same system, whether that's a call center, a shared fax line, or a multi-department switchboard. Without DNIS, the receiving side would have no way to tell which of its published numbers a caller actually used, only that a call came in. DNIS depends on DID service to work: the carrier has to track the specific number dialed before it can hand that detail off, which is why the two are so often mentioned together. Configuring which numbers feed into which destination is typically a routing administrator's job, and one practical form that takes is setting up an extension-based routing rule so a DNIS-identified number lands with the right person automatically.
A Common Case: One System, Several Published Numbers
A company advertises separate numbers for sales and support, but both ring into the same phone system. DNIS is what tells that system which number the caller actually dialed, so the call lands on the right team without a human having to ask first.
FAQ
Does DID service also provide DNIS?
Yes. DNIS depends on DID: the carrier has to track which specific number was dialed before it can pass that detail to the receiving system. The two are frequently used together on systems that route several numbers into one destination.
Is DNIS the same as ANI?
No, they answer opposite questions. ANI identifies who is calling, while DNIS identifies which number the caller dialed to reach the receiving system.
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