Operation Manual

Table Of Contents
Tones and Signals
BusinessPhone Cordless DT400/DT410/DT420/DT43086
Signals
Ringing signals are emitted from the phone..
Note: The tones and ringing signals in this guide refer to the
standard system but may vary between countries.
Internal ringing signal
- repeated after 4 s
External ringing signal
- repeated after 4 s
Automatic call-back signal