Siemens 4075 Operating Instructions Manual page 83

Channel
An ISDN line, like an analogue telephone line, has two cables running into
your house but a distinction is made in ISDN between the two logical user
channels, known as the B-channels (which have nothing to do with the
physical cables) and the control channel, known as the D-channel.
Charge display
See AOC-D and AOC-E.
CLIP (Calling Line Identification Presentation)
Subscriber A calls subscriber B. The call number of A appears on B's
telephone display.
CLIR (Calling Line Identification Restriction)
The number of the calling line is not displayed.
COLP (Connected line identification presentation)
Subscriber A calls subscriber B. The call number of B is displayed on A's
telephone. If B has programmed call forwarding or deflection to C, then the
number dialed and the number transferred will not be the same; the call
number of C will be displayed, provided C has not suppressed his number.
COLR (Connected line identification restriction)
The call number of C is not displayed on A's telephone if C has set up COLR.
Conference call
See Three-party conference.
Consultation call
You are engaged in a call. You can use the "Consultation" function to
interrupt the call briefly to set up a second external call or internal call to
another subscriber. If you speak to the other person and then end the call,
this was a consultation call. If you switch back and forth between the first
and second parties, this is called toggling.
CW (Call Waiting)
See Call waiting
D
Digital exchange
Computer-controlled memory time switches are used to set up calls quickly
and activate enhanced features such as => consultation calls, => call
waiting, => three-party conference, => call deflection, etc.
D-channel
Control channel for an ISDN line. See Channel.
E
ECT (Explicit call transfer)
See Switching.
Electronic code lock
Personal identification number (=> PIN) that you can use, for example, to
prevent people using your phone without your consent – calls to the
emergency services can still be made however. Incoming calls can still be
taken.
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