1. Transfer, Mute, Conference Call, Paging, Hold, Check, Remove. 2. STN graphic display module LCD 3. Incoming call indicator 1. Using STN graphic display module LCD, 30 characters of double line English display, which can display the date, time, extension number, time of call, call information, calling state, the programmed state. 2. Direct key 1-21, using LED two-color ( red / green ) indicator ...