Polycom 4-Line Phone Owner's Manual page 44

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You can create a conference at any time between an active call and a call
on hold by pressing the Join soft key. The Join function is only available if
you have only two calls on your phone.
To Join two calls with yourself:
1. Have one call on hold while talking to another
2. Press the More soft key then press the Join soft key. You will then be
connected to both callers.
Splitting Joined Calls
After you have joined two calls, you may split those calls back to their
individual calls.
To split a Joined call:
Press the Split soft key to split the joined calls.
All calls are split into individual calls and put on hold
Setting Up Conference Calls
You may conference up to two calls plus yourself (a 3-way call).
To set up a conference call:
1. Call the first party.
2. Press
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or the Confrnc soft key to create a new call.
Owner's Manual