XML example of the Sign Out button.
<Dashboard> or <CallButtons>
...
<Button>
<title>Sign Out</title>
<action>SIGNOUT_CHANGE</action>
<value>0</value>
<enabled>true</enabled>
<confirm>false</confirm>
<description></description>
<icon></icon>
<scale>CENTER_INSIDE</scale>
</Button>
...
</Dashboard> or </CallButtons>
This action can also be initiated using ADB, an MDM, or a third-party app. For example, in ADB, you can use the following command:
$ adb shell am broadcast -a wfc.voice.SIGN_OUT --es change 0