Sony Ericsson Cordless DT590 - Manual (Page 46)

Outgoing Calls, Busy/No-Answer
MD Evolution – Cordless DT590 46
Busy Extension
You call an extension and receive busy tone.
Intrusion
You can intrude on an ongoing call on a busy extension (if this
function is allowed). 3
Press to intrude.
Intrusion tone is heard and a three-party call is established. When
the called extension replaces the handset and you keep off hook,
the called extension will be recalled automatically.
Note : If you still hear the busy tone, then your extension
does not have the authority to intrude or the desired
extension is protected against Intrusion.
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. Ь Ы
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.