AASTRA DT590 for MD Evolution User Guide EN - Manual (Page 44)

Outgoing Calls
MD Evolution – Cordless DT590 174
Notes:
A personal abbreviated number accepts values from 00 to
19. An abbreviated number on the general list is usually
from 200 to xxx.
An abbreviated number is generally complete. It may also
be incomplete, in which case you will need to complete the
number by dialling the rest manually. This may, for example,
allow you to access a series of numbers using just one
abbreviated number