Call out / answer / reject
Mute / unmute (microphone)
Call Hold / Resume
Call Waiting
Intercom
Caller ID Display
Call Forwarding (Always/Busy/No Answer)
Call Transfer (Attended/Unattended)
Call Parking/Pick-up (depending on server)
Redial / Auto Redial
Do-Not-Disturb (per line / per phone)
Auto-Answering (per line)
Voice Message (on server)
Local 3-way Conference
Hot Line
Hot-Desking
