Convenient and secure telephone communication
20
kap01.fm5
27.11.98
Profiset 30isdn engl.: A30853-X300-B107-1-7619
DTMF signalling
When a connection is set up, you can use the keypad to
transmit DTMF signals (tones in
d
ual-
t
one
m
ulti
f
requency),
e.g. to control an answering machine remotely.
Keypad signalling
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.