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 for Dialled Number Identification Service
From The Free On-line Dictionary of Computing (30 December 2018) :

  Dialled Number Identification Service
      (DNIS) A service that tells the recipient of
     a telephone call the telephone number dialled by the person
     making the call.  It is used by call centres hosting multiple
     numbers, voicemail systems and ISPs offering shared dial-in
     Compare ANI, Caller ID.

Contact=webmaster@dict.org Specification=RFC 2229