AASTRA DT590 for MD Evolution User Guide EN - Manual (Page 45)

175 MD Evolution – Cordless DT590
Outgoing Calls, Busy/No-Answer
Outgoing Calls, Busy/No-Answer
Sometimes you make a call but the person is not available.
These functions will help you in your attempts to establish contact
with the called party.
You can also make a call via the Phone Book, see section “
Local
Phonebook ” on page 187 and “ Central Phonebook ” on page 196.
Automatic Callback
You call an extension and receive busy tone or get no answer. This
can also be used if no external line is free: 1
Press.
Verification tone. Ъ Щ
Press.
You are called back if the extension finishes the ongoing call or the
next time the extension finishes a new call. You have to answer
within eight seconds; otherwise the Callback service is cancelled.