From the base
1)Press 
on the base to join the conference call.
2)To hang up, press end/find hs. The handset(s) will still be connected to the call.
From the handset
1)Press talk/flash or 
on the handset to join the call.
2)To hangup, return the handset to the cradle or press end on the handset. The base or other handset will still be connected to the call.
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Using Your Phone [ 4 8 ]
Using Your Phone