3 / 61 Introduction to the Phone User Interface1.1 KeypadThe above picture shows the keypad layout of the device. Each key provides its own specific function.User should refer to the illustration in this section about the usage of each key and the description in thisdocument about each function. Message waiting / Incoming call indicator - The light flashes when the telephone rings for incomingcalls, and when a message is waiting if the Messages Waiting Indication (MWI) is supported in thetelephone system. DSS keys - You could customize these DSS keys with some preset functions. Standard Telephone Keys - The 12 standard telephone keys provide the same function as standardtelephones Hold key - You could hold a call by pressing the key. Transfer key - You could transfer a call by pressing the key. Redial key- By pressing ‘Redial’ button, user can redial the last dialed number. MWI key- When have a voicemail, press "information" key, you can consult to the message. Volume -/+ - By pressing ‘Volume -/+’ button, user can adjust the volume. Microphone Mute - User can mute the microphone with this button during talking mode. Hands-free Speaker - By pressing this button once, user can turn on the audio channel of hands-freespeaker.DSS KeysHold keyTransfer keyRedial keyMWI keyVolume Control keySpeakerMute keyMessage waiting /Incoming call indicatorSpeaker key