Convenient and secure telephone communication

DTMF signalling

When a connection is set up, you can use the keypad to transmit DTMF signals (tones in dual-tone multifrequency), e.g. to control an answering machine remotely.

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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Siemens 30ISDN operating instructions Keypad signalling