BT BT2500 Quick Setup And User Manual page 67

When the other handset answers you can announce
the call and then press
a 3-way call
with two external callers. Or, you can hold a 3-way
call between 2 handsets, if you have more than 1
registered to your base and 1 external caller. Once
the 3-way call is in progress other handsets registered
to the base can join the call by pressing
1. During a call, select Options by pressing
the Multi call is displayed,
press
2. Either enter the number you want to call or press
internal handset you want and then press
to call. When the second call is answered, the first
external caller will be put on hold.
3. Select Join by pressing the
callers will be joined in a 3-way call.
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