Setting up a 3-way conference call
When you have both an external call and an intercom call in progress, you can set up a three- way conference call, like this:
1.During an external call, press the 
key and then the number of the handset you want to join the
2.The called party press 
key to answer.
3.The calling party can press the 
key to start the
4.Either of the two internal handsets can press
the 
key to leave the conference call at any time.
Note:
If one of the handsets drops the conference call, the remaining handsets will continue the conference.
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