Operation Manual

Outgoing Calls
BusinessPhone – Cordless DT400/DT410/DT420/DT43018
Automatic call-back
You call an extension and receive busy tone or get no answer.
5
Press
Verification tone.
T
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 call-back service is cancelled.
Busy extension
You call an extension and receive busy tone.
Camp-on
You can notify a busy extension of your call by a muted ringing call
(if this function is allowed).
4
Press to camp on
Keep the handset off hook. When the called extension replaces the
handset, it will be called automatically.
Note: If you receive the busy tone again, the desired
extension does not allow camp-on.
Intrusion
You can intrude on an ongoing call on a busy extension (if this
function is allowed).
8
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.