Three-Way Calling
To initiate three-way calling, press the
button while
a call is in progress, and make a second phone call, as
described under “Making a Second Call While Current
Call is in Progress”. After the second call has established,
press and hold the 
button until you
hear a double
beep, indicating that the two calls have been joined into
one conference call.
See also:
Paging
To learn how to page, refer to “Working with Automated
Systems”. Paging works properly except for pagers of
certain companies, which time out a little too soon to
work properly with the Ucon ...
Setup
To switch to system setup, you may say on of the following:
• “Change to setup”
• “Switch to system setup”
• “Change to setup”
• “Main menu setup” or
• “Switch to setu ...
General Information
The Sentry Key system complies with FCC rules Part 15
and with RSS-210 of Industry Canada. Operation is
subject to the following conditions:
• This device may not cause harmful interference.
...