3 way calling with Home Voice Setup

Pick up phone handset (causing the line to be off-hook).
Hear a dial tone
Dial the first number and greet the first party
Press the hook flash button (or quickly tap the on-hook sensor on the phone)
Press 2 on the dialpad to put the first caller on hold
Dial the second number and greet the second party
Press the hook flash button again (or quickly tap the on-hook sensor on the phone)
Press 3 on the dialpad to reconnect the first caller (placed on hold previously)
Enjoy the 3 way conversation