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call between A and B.
Step 3. Enter #*29 + C, and press # to dial user C's number.
Step 4. User C picks up the phone.
Step 5. User A presses Flash key or lightly presses the hook of the phone. At this time,
users A, B, and C establish a conference call.
Cancel the conference
If user C is invited to the conference after answering the call, user A can press Flash key
or lightly press the hook to remove user C from the conference.
End the conference
During the conference, if one party hangs up the call (not including user A), the other two
users can continue the conversation.
If user A hangs up the phone, the conference ends and returns to standby status.