User guide

Other Useful Features
DT412/DT422/DT43296
Emergency mode
In the event of an emergency, the operator can set the exchange
into Emergency mode, during which only preprogrammed
extensions are permitted to make calls. If your extension is not
assigned with this category and you try to make a call, you will
not receive a dial tone.
Malicious Call Tracing
If you are disturbed by bothersome or malicious external
incoming calls, you can request number tracing from the network
provider.
You can invoke tracing during or after an ongoing conversation.
The external line can be held for a limited period of time.
Order
During an ongoing conversation:
R Press (see display).
Dial tone.
*39# Dial.
The system acknowledges with different tones whether the
tracing request was accepted or rejected.