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ISDN glossary
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FFree choice of outgoing MSN
Feature that can be used to define which individual MSN is to be used for
the next call. This is not only decisive for the call number display on the
called party‘s phone, but also when it comes to calculating call charges. This
is because call costs can be broken down according to MSN on network pro-
vider phone bills free-of-charge, so that the charge is shown against the rel-
evant MSN that was used for the call.
HHands-free dialling
Enhanced phone feature: You only lift the handset when the called party an-
swers.
Hands-free talking
A phone‘s hands-free system not only permits open listening, but an inte-
grated microphone also allows you to talk to the subscriber when the hand-
set is on hook. This means that other people in the room can also contribute
to the conversation.
Hold
Interrupt and restore an existing connection. Mainly used for enquiry calls
and for toggling between calls.
Hot key selection
This locks the telephone for all call numbers except one individually entered
number. The connection is automatically set up to the stored call number af-
ter the handset is lifted and a key is pressed. Ideal for children who cannot
yet dial a phone number (function formerly known as direct station selec-
tion). Emergency calls can always be made.
Hot keys/fun ction keys
Enhanced phone feature that enables a limited number of call numbers to
be allocated to special keys. This enables the programmed numbers to be
dialled at the touch of a button.
IInternal calls
Free connection between base station telephone and handsets.
Internal ringer tone
Special signal on telephone systems to distinguish internal and external
calls.
ISDN
Abbreviation for Integrated Services Digital Network. The integration refers
to telephones. fax machines or data transfer, for example.
ISDN abbreviations
CW Call Waiting
CF Call Forwarding
3PTY 3-Way Calling
CCBS Call Back on Busy
CD Call Deflection during ringing phase
KKeypad
Keypad supports special function keys such as asterisk (*) and hash (#). This
enables functions offered by your network provider to be initiated in the
same way as in the analog network with a code like “#4711*”.
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ISDN glossary
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LLock certain numbers, outgoing/call restrictions
This enhanced feature is used to prevent certain call numbers from being di-
alled from an ISDN phone (or from an analog phone on an ISDN system wit
the relevant feature), for example call numbers beginning 0180 or 0190
(soon: 0900).
Lock function/PIN
A code protects your phone against unauthorised use. You can prevent cer-
tain call numbers or call number groups from being dialled by entering lock
numbers consisting of one or more digits.
MMCID
See Trace.
MSN
Multiple Subscriber Number. The call numbers of an ISDN multipl e device
connection. These are used to address the terminal devices specifically, for
example the fax machine has a separate number. The basic price of the stan-
dard and enhanced connection include three MSNs. One ISDN connection
can be allocated up to ten MSNs.
Multiple device connection
ISDN connection that, unlike the system connection, provides up to ten
MSNs instead of a block of extension numbers. This is the most common
type of ISDN connection used by private customers.
Multiple subscriber number
See MSN.
Music on hold
A melody is played to the waiting party during an enquiry call or while he is
being transferred.
Mute
Enhanced phone feature that deactivates the integrated microphone (in the
handset or hands-free equipment).
NNotebook function
During a telephone conversation you can enter a call number in the tele-
phone‘s temporary storage, so that you can dial it later.
NT/NTBA
Network Terminator or Network Terminator Basic Access. The NT termi-
nates the public T-ISDN line. The NT forms the bridge to the existing tele-
phone socket. Only the NT can now be connected to the telephone socket.
No other analog terminals should be connected to the telephone socket.
ISDN terminals and other ISDN sockets are connected to the NT.
OOpen listening
A touch of a button enables all those present in the room to hear a telephone
conversation via the integral loudspeaker. See also hands-free talking.