Convenient and secure telephone communication
DTMF signalling
When a connection is set up, you can use the keypad to transmit DTMF signals (tones in
dA call is in progress.
T
Enter the control digits.
The digits entered appear on the display for several seconds and the transmitted signals can be heard via handset or loudspeaker.
Keypad signalling
d S*S
b
Instead of DTMF signalling, you can transmit keypad infor- mation elements (IE) e.g. to activate features on PBXs or certain ISDN services in several countries (➔ page 33:
Signalling methods to control the ISDN services).
Since DTMF signalling is set by default for your telephone, it must first be deactivated.
A call is in progress.
Press the Programming key, the Asterisk key and again the Programming key.
Keypad signalling is activated for the current call. The key- pad digits entered appear on the display preceded by the symbol ”_ “.
Press the Programming key, the Asterisk key and the Pro- gramming key again to return to DTMF signalling.
Replace the handset to reactivate DTMF signalling.
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