- two-out-of-six multifrequency code
- n COMP Zwei-aus-Sechs-Multifrequenzcode m
Dictionary English-German Informatics. 2015.
Dictionary English-German Informatics. 2015.
Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… … Wikipedia