37CONVENIENCE FEATURESDO NOT DISTURBUse this feature when you want to block calls to your keyset.• While on-hook, press the DND button or dial 401. The DND button lightssteady red to remind you of this mode.• To cancel DND, press the DND button again or dial 400. The DND light turnsoff. You can make calls while in the DND mode.NOTES:1. If the Hot Keypad feature has been turned off, you must first lift the handsetor press the SPEAKER button.2. If you place your keyset in DND mode and you do not have a DND button,your TSI button will flash to indicate DND status.ONE TIME DNDIf you are on a call and you do not wish to be interrupted while on that call, youcan press the DND button and place your station in Do Not Disturb. When youhang up at the end of the call, DND will be automatically canceled and your key-set will be able to receive new calls. This feature requires a DND button.MUTEYou can mute the handset transmitter or the microphone during any conversa-tion:• Press the MUTE button. It will light red.• To resume speaking, press the MUTE button again. The light turns off.BACKGROUND MUSICWhen a music source is supplied, you may listen to music through the speaker inyour keyset:• While on-hook, press the HOLD button to hear music.• Press the HOLD button again to turn music off.You can set the level of background music by using the VOLUME buttons while lis-tening to the music. This does not affect the speakerphone level.