Creating A Conference By Releasing Privacy; Making A Call Private; Checking Call Length Using Call Duration Timer - Nortel ICS 7.1 Coordinator Manual

When another telephone joins a call, the participants on the
call hear a tone, and a message appears on the Norstar display.
You cannot join a call without this tone being heard.

Creating a conference by releasing privacy

If a line is programmed with privacy, you can turn privacy off
to allow another person with the same line to join in your
conversation and form a conference. All the rules applicable to
a conference apply except there is only one line in use, instead
of the usual two. This means that you cannot split a conference
set up using Privacy.
1. Press
2. Tell the other person to press the line button and join your
conversation.
Only two system telephones, in addition to the external caller,
can take part in this kind of conference.

Making a call private

If a line is programmed not to have privacy, you can turn
privacy on for a call, preventing other people with the same
line from joining your conversation.
Checking call length using Call Duration
Timer
With this feature you can see how long you spent on your last
call, or how long you have been on your present call.
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Modular ICS 7.1 System Coordinator Guide