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Synergy 4100 – Issue 3 – Edition 1 – 21.08.06 – 7771
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2. Enter the internal handset number that you want to hold
the 3-way call with, then select the 
OK option.
3. When the internal handset user answers, select the 
Con
option to begin the 3-way call.
4. Press  to finish the 3-way call.
Using additional handsets