DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Mehrfrequenzwahlverfahren /mˌeːɾfreːkvˈɛntsvɑːlfɛɾfˌɑːrən/ (MFV /ˌɛmˌɛffˈaʊ/) <neut, n, sg>
   dual tone multiple frequency signalling <n>DTMF,  /dˌeːtˌeːˌɛmˈɛf/ , multi-frequency dialing <n>
      Synonym: Tonwahlverfahren
    see: MFV-Signale