1.1 General Features114 Feature ManualFeature Manual References1.1.8 Built-in Voice Message (BV)1.1.61 Flexible Buttons1.1.82 Message Waiting1.1.120 Voice Mail APT Integration1.1.121 Voice Mail Inband (DTMF) IntegrationOperating Manual References1.3.61 Message Waiting for Another Extension1.3.62 Message Waiting for Another Extension Lock2.1.7 System Feature Assignment—Extension Lock—CANCEL ALL3.1.3 Flexible Button Assignment—Message for another extension button1.1.84 Microphone MuteDescriptionDuring a conversation, a proprietary telephone (PT) user can disable the built-in microphone to consultprivately with others in the room while listening to the other party on the phone through the built-in speaker.When Microphone Mute is active, the user can hear the other party's voice, but the user's voice is muted.Conditions• This feature is only available on PTs that have an AUTO ANS/MUTE button.Operating Manual References1.3.63 Microphone Mute1.1.85 Music on HoldDescriptionAn outside party on hold will hear audio to inform the party that the call is still on hold.The following types of audio are available:a) External audio sourceb) ToneIf "Tone" is selected, the following cyclic tone is sent to the held outside (CO) line.The external audio source can also be used for BGM ( 1.1.7 Background Music (BGM)).1 s