BT SYNERGY 4500 - Manual (Page 85)

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Synergy 4500 – Issue 5 – Edition 1 – 18.01.07 – 7993
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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