| Subject | English | German |
| gen. | dual tone multi frequency | Mehrfrequenzverfahren |
| gen. | dual tone multi frequency | Zweitonmehrfrequenzwahlverfahren |
| gen. | dual tone multi frequency | MFV-Verfahren |
| IT, nat.sc. | dual tone multi-frequency | Doppel-Ton-Multifrequenz-Generator |
| commun. | dual tone multi-frequency DTMF; dialling method | Multifrequenzwählverfahren (CCITT Yellow Book Vol. VI. 1 Recommendation Q.23) |
| commun. | dual tone multi-frequency DTMF; dialling method | Multifrequenzverfahren (CCITT Yellow Book Vol. VI. 1 Recommendation Q.23) |
| commun. | dual tone multi-frequency operation | DTMF-BetriebMehrfrequenzverfahren |
| commun. | dual-tone multi-frequency dialling | Mehrfrequenz-Wahl |
| IT, nat.sc. | dual-tone multi-frequency generator | Doppel-Ton-Multifrequenz-Generator |
| commun. | dual-tone multi-frequency DTMF method | Mehrfrequenz-Verfahren |
| el. | multi-frequency tone signal | Mehrfrequenztonsignal |