3Com SuperStack 3 NBX Administrator's Manual page 161

The other secondary telephone is also an NBX Business Telephone
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(extension 1018). The telephone is used by the person (Connie) who
answers the manager's telephone whenever the manager's assistant is
not available. Buttons 10, 11, and 12 are configured as bridged
extension appearances of the manager's telephone (1027).
Example 1: If there are no active calls on Alicia's telephone, a call made
to her telephone from either an internal or outside telephone rings on
button 2 on her telephone, button 4 on Bradley's telephone and button
10 on Connie's telephone.
Bradley answers the call by pressing button 4. After identifying the
person who is calling, Bradley places the call on hold and informs Alicia of
the call. Alicia presses button 2 on her telephone to take the call.
During the time that Bradley is talking to the caller, neither Alicia nor
Connie can access the call. Alicia can pick up the call only after it is placed
on hold by Bradley. Similarly, after Alicia picks up the call, neither Bradley
nor Connie can access the call. If Alicia wants to include either Bradley or
Connie in the call, she can set up a conference call.
Example 2: Alicia wants to place a call but wants to keep all three
bridged extensions available for incoming calls. Alicia can place the call
using button 1.
Neither Bradley's telephone nor Connie's telephone shows any indication
that there is a call on Alicia's telephone, because button 1 on Alicia's
telephone is not configured as a bridged extension.
Example 3: Three incoming calls have arrived on Alicia's telephone (on
buttons 2, 3, and 4). Alicia is talking on button 2, Bradley has placed the
second call on hold, and is talking to the third caller.
A fourth call arrives at Alicia's extension and rings on button 1. Neither
Bradley nor Connie can answer this call because that button on Alicia's
telephone is not a bridged extension appearance.
If a fifth call arrives at Alicia's extension before the fourth call stops
ringing, it is sent directly to Alicia's voice mailbox, because all buttons are
being used.
Creating and Managing Bridged Extensions 161