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ISDN Glossary
A
Access classes
Permitted connections (e.g. internal only, incoming or unrestricted call
access) are defined on the terminals of a telephone system.
Access levels
Different levels of access can be assigned to different users on your base
station telephone. For example, user A may only be allowed to take
incoming calls, whereas user B may also make outgoing calls without any
restrictions.
Advance dialling, see also en-bloc dialling
On some display telephones you can enter a call number, check it is correct
and then dial.
AOC-D
Advice of Charge: During the Call. Charge information is transferred during
the call.
AOC-E
Advice of Charge: at the End of the Call. Charge information is not
transferred until the end of the call.
Automatic callback
See Callback on busy.
Automatic redial
If the number is busy, further call attempts are made automatically.B
B
Bar/lock
Protects the line against unauthorised use.
Barring certain numbers, outgoing/call restrictions
With this enhanced feature you can suppress dialing of certain numbers
from an ISDN telephone (or from an analogue telephone connected to an
ISDN system with the appropriate feature), such as premium rate numbers.
C
Call deflection
CD. This must be explicitly enabled by the provider for each ISDN line. With
CD you can transfer an incoming call to another call number while it is
ringing. You do not need to answer the call. Since the caller has no influence
on where the call will be forwarded (to a mobile phone for example), you pay
the appropriate charges. The caller will be billed only for the normal
telephone charges to the number dialled.
Call forwarding
CF (Call Forwarding) You wish to permanently forward calls to a different
line. Call forwarding can be set up externally via the exchange or internally
on the terminal.
Call forwarding can be set up separately for each of your call numbers
(MSNs) - to your mobile phone when you are on holiday, to the office, to a
neighbour, etc.
This is set up in the provider's local exchange. The call therefore never
reaches the line originally called.
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