Question type 1
How to build a three-way conference call?2017-01-21
Q: How to build a three-way conference call?

A: Steps:
1.   A call B
2.   B answer,
3.   A or B, press the button “CONF”, and send a number C
4.   C answer, now, A or B are in hold state
A or B press the button “CONF” once again. If there’s a word “conference” in the screen, it’s effective.