Siemens 3035isdn - Manual (Page 76)

133
Press the keys in the
specified order
Appendix
17.5.00 Anhang.fm Gigaset3035isdn A31008-G3035-B101-6-7619 Korrektur: 0
Appendix
Using CENTREX features
CENTREX (CTX) is the name of a virtual ISDN telephone
system. In order to take advantage of all the features it of-
fers, you can activate the keypad protocol in addition to the
usual dialling procedure in call switching.
CENTREX features can only be used if you are a subscriber
belonging to a CENTREX group. Otherwise the functions
described here are not relevant.
Signalling options
The digit keys can be used to transmit keypad information
elements to control special services. Check with your pro-
vider to see which information and codes you can trans-
mit.
Message Waiting Indication (MWI): CENTREX voice
mails are entered in the caller list and are therefore sig-
naled as a letter symbol. The answering machine key also
flashes.
Calling Name Identification (CNI): When incoming calls
are received from other CENTREX subscribers, the caller‘s
call number or name appears on the display.
Distinctive Ringing (DR): Your base station telephone
signals internal CENTREX calls with the internal double
ring.