Dials the call out after off hook and entering the number.
AnswerCall
Answers the incoming call when the phone is ringing.
RejectCall
Rejects the incoming call when the phone is ringing.
EndCall
Ends the active call.
Transfer
Transfer softkey will show up after pressing TRAN button and entering
transfer target number. Press Transfer softkey to do blind transfer.
Split
In auto-attended transfer mode, after establishing the second call, press Split
to quit transfer and go back to normal talking status.
ConfCall
Conferences the active calls.
ReConf
Re-establish the conference among the calls on hold.