Step Name | Description | Expected
| Step 1 | Make a voice call, Check the layout of Endcall botton | The Endcall should be the center of the bottom.
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| Step 2 | Make a conference call, Check the layout of End conference call botton. | The Endcall should be the center of the bottom.
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| Step 3 | Switch the attendance in conference, Check the "End current call and answer" and "End held call"botton | The icon should be the center of the bottom.
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