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101
Appendix
3-party conference
A call with one internal and two external subscribers.
AOCD
Advice of charge during an outgoing call.
AOCE
Advice of charge at the end of an outgoing call.
B-channel
This is the “bearer” channel of an ISDN line, used for voice and data traffic, and it has
a transmission rate of 64 kbit/s.
Basic ISDN connection
An ISDN connection with two user channels (B-channels) and one control channel
(D-channel). The two user channels can be used independently of each other to
access all ISDN services. For example, you can make a call and send a fax simultane-
ously.
Call assignment
Every MSN is assigned to the internal analogue terminals (11 - 14) which are to signal
calls for the respective MSN.
Call forwarding
Call forwarding in the exchange means that you can always be contacted under your
own MSN, irrespective of where you are. From your telephone you enter the desired
destination number: every subsequent call to your telephone is then automatically
forwarded to this number. There are three types of call forwarding: immediate, on
busy and after a specified time. Calls can be forwarded world-wide to all telephone
and mobile radio connections.
For call forwarding in the communications system, you specify destinations for
incoming calls to each of the connected terminals. If the destination is an external
one, both B-channels are busy for the duration of the forwarding, i.e. the connection
is busy, and no further external calls are possible. Charges incurred for the forwarded
call are billed to the internal line from which it was forwarded.
Call pickup
You can pick up an external call at your telephone when another telephone signals
the call.
Call through
You can specify an MSN that is to react to a call by making the second B-channel of
your ISDN connection available for relaying that call.
Glossary