AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 45)

45 MD Evolution – Cordless DT412 / DT422 / DT432
Outgoing Calls, Busy/No-Answer
Call with Temporary Protection
When you place either an internal or external call that you deem
particularly important, you may choose to activate phonic
protection.
This protection, available on a call by call basis, prevents any
phonic intervention during your communication.
More particularly, this service protects you from any intrusion or
offer that could take place during your conversation, most
specifically from an attendant. These services are then refused in
light of your conversation in progress. 74
Dial the prefix "74" to access to the temporary call protection
service.
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Next, directly dial the desired number.
You may do so according to any of the methods available for
dialling an internal or external number. æ
Press to make the call
Note: Certain extensions (such as yours) may possibly be
equipped with permanent phonic protection. The above-
described service is therefore applied to all calls that are
placed, without requiring any particular action on your part.