Siemens 30ISDN User Manual

kap01.fm5

27.11.98

Profiset 30isdn engl.: A30853-X300-B107-1-7619

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.

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.

d

A 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. 

d

A call is in progress. 

S*S

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.

b

Replace the handset to reactivate DTMF signalling.