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Glossary
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AOC-D
Display during and at end of connection.
AOC-D/E
Advice of charge-during/end.
AOC-E
Display only at end of connection.
ARP
Address Resolution Protocol
Assignment
An external call can be signalled to internal subscribers. The entries
in the "Day" option and "Night" option can be different.
Asynchronous
A method of data transmission in which the time intervals between
transmitted characters can vary in length. This allows computers
and peripheral devices to intercommunicate without being synchron-
ised by clock signals. The beginning and end of the transmitted
characters must be marked by start and stop bits – in contrast to
synchronous transmission.
ATM
Asynchronous transfer mode
Attention tone
Superimposing of an acoustic signal during a telephone call e.g. for
call waiting.
Authentication
Check on the user's identify.
Authorisation
Based on the identity (authentication), the user can access certain
services and resources.
Automatic callback
Special feature on telephones: By pressing a key or code, the caller
requests a call back from the engaged terminal. If the subscriber
you want is not at their desk or cannot take the call, they are auto-
matically connected with the caller as soon as they have used the
telephone again and replaced the receiver.
Automatic callback
This function can only be used on telephones that permit suffix dial-
on busy
ling. An automatic callback from an inquiry connection is not pos-
sible.
Automatic callback
You urgently need to contact a business partner or internal sub-
on busy (CCBS)
scriber. However, when you call, you always hear the engaged tone.
If you were to receive notification that the subscriber had ended the
call, your chance of reaching them would be very good. With "Call-
back on Busy" you can reach the engaged subscriber once they
have replaced the receiver at the end of the call. Your telephone
rings. When you lift the receiver, a connection to the required sub-
scriber is set up automatically. An internal "Callback on Busy" is de-
leted automatically after 30 minutes. The external "Callback on
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