VTech VDP650 User Manual page 37

Example - barging in a shared call:
1. Alice is on a call.
2. Alice shouts across the room,
"Bob, can you join my call on
line 3?"
3. Bob presses L3 to
barge in the call.
Bob is now in a conference call with
Alice and the caller on line 3.
Alice's handset
37
Bob's handset