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Appendix
Press the keys in the specified order
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.
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