When any information on the display has changed, the application receives the DisplayUpdateEv . The PhoneHookswitch component models the physical hookswitch on a telephone hardware set. Applications receive the HookswitchStateEv event when the state of a hookswitch changes. The PhoneLamp component models a light-indicator on the telephone hardware set. Additionally, lamp components may be associated with a button component.
Applications receive the LampModeEv when the mode of the lamp component has changed.
The PhoneMicrophone component represents the audio input device on a telephone hardware set. Applications receive the MicrophoneGainEv event when the gain of a microphone component has changed. The PhoneRinger component represents the audible ringing device on a telephone hardware set. The ringer component has several attributes. First, applications may control the ringing pattern of the ringer component.