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ISDN glossary
Call divert (via second B channel) / internal call divert
While external call divert takes place in the local telephone exchange of the network
provider, internal call divert is implemented by your telephone. Your telephone for-
wards the call via the second line of your ISDN connection. This means both phone
lines are engaged for the duration of the call. You pay the charges for the connec-
tion to the forwarding number. However, you save yourself the network provider's
charges for this function.
Call forwarding during the call phase
CD, Call Deflection. Must be explicitly enabled by the network provider for each ISDN
connection. CD enables an incoming call to be forwarded to any phone number
while it is ringing, without having to answer the call. Because the caller cannot
affect on where it is forwarded (for example, to a mobile phone), you will pay the
resulting charges. The caller must only pay the normal telephone charges to the con-
nection he dialled.
Call transfer (e. g., for ISDN PABX's)
ECT, Explicit Call Transfer. User A calls User B. He puts the connection on hold and
calls User C. Rather than connect everyone in a three-party conference, A now trans-
fers User B to C and hangs up.
Call waiting
CW, Call Waiting. Service provided by the network provider. An acoustic signal dur-
ing a call indicates that another caller is waiting. In addition, ISDN phones indicate
this with a displayed message. You can then decide whether to accept or reject the
second call.
Call waiting protection
Deactivates the call waiting signal.
Callback when the call is not answered
If a user does not respond when called, a caller can arrange an automatic callback.
As soon as the destination phone has completed a call and is free again the caller is
rung back. This service must be supported by the exchange. The ringback request is
automatically cancelled after approximately 2 hours (depending on the telephone
exchange.
Callback when the number is busy
Callback must first be activated on the caller's terminal. A connection is established
automatically as soon as the destination phone is no longer busy. As soon as the
connection is free the caller is rung back. As soon as the caller lifts his receiver the
connection is made automatically.
Caller identification
Displays caller's phone number, name or type of connection (e. g., exchange/inter-
nal) on the telephone screen.
Caller list
Depending on the setting, the calls list contains callers you haven't reached, or those
you have spoken to. The last 20 missed calls and the last 20 accepted calls are stored
with their phone number, date and time. If you wish to do so, you can return the call
to these users directly from this list.
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