Redial key is used for re-dialing Disckey is used for disconnecting the call. Conf key is used for creating a conference. Speaker key is used activate Handsfree The corresponding icon appears in the header icons area of the LCD screen Mute key is used starts the mute function. During the mute state, the telephone stops transmitting voice towards the other party in conversation. Mute The corresponding icon appears in the header icons area of the LCD screen Recordkey is to record a personal conversation bi-directionally (i.e., both calling and called party’s voices are recorded). In conversation state, pressing Rec key starts recording. When the key is pressed again, recording stops. During the same conversation record function can be used several times for multiple and partial recordings. Record The corresponding icon appears in the header icons area of the LCD screen Directory key is used to access Directory of system Headset key is used for headphone. Headphone The corresponding icon appears in the header icons area of the LCD screen. Callback key is used to activate call back if called party is busy or no answer. Callback The corresponding icon appears in the header icons area of the LCD screen. Intrudekey is used to intrude in a call when the called number is in call. Callback The corresponding icon H appears in the header icons area of the LCD screen. P1 key is used to park the line. Parking is number 1. P2 key is used to park the line. Parking is number 2. P3 key is used to park the line. Parking is number 3. P4 key is used to park the line. Parking is number 4.
appears in the header icons area of the LCD screen 
appears in the header icons area of the LCD screen 
appears in the header icons area of the LCD screen 
appears in the header icons area of the LCD screen.
appears in the header icons area of the LCD screen.