Basic Functions
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Multiple Connections
Your device can handle two connections simultaneously, i.e. you can speak with
two callers at the same time, and switch back and forth between these connec-
tions (toggle) or conduct a three-party conference. Any further callers will hear a
busy signal.
When the system administrator has configured a call queue, any further calls are
given a place in the queue (please refer to the Calls in the Call-Waiting Queue
starting on page 45 section).
DTMF Postdial/VF Signalling
Depending on the system configuration, your telephone is automatically set to VF
signalling during a call. Use VF signalling, e.g. to query a voice message or voi-
cebox. Please contact your system administrator if you have questions regarding
this function.
Charge Display (Charges)
If your network operator transmits charge information – even for external calls you
dial yourself – you will see the charge amount for the call during and after the call.
Transmission of Call Numbers
There are various ISDN services which either allow or prevent transmission of call
numbers between users.
“CLIP” feature
CLIP is an abbreviation which stands for “Calling Line Identification Presentation”.
The call number of the caller is displayed (if transmitted). If the call number has
also been entered into the directory of the Aastra 800 / OpenCom 100, the name is
displayed.
“CLIP no screening” feature
“CLIP no screening” offers transmission of an arbitrary call number for outgoing
connections instead of transmitting the actual call number of the caller. This
means that instead of your call number being displayed, e.g. a service call number
is displayed to the user you called. The “CLIP no screening” feature must be
ordered from the network operator and authorised for use by the system adminis-
trator during system configuration. When you receive an external call where the
caller is displaying a different call number than the one actually technically being
transmitted, a “?” appears next to the call number on the display. If the call number
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