Polycom VVX 1500 C Business Media Phone for Cisco Unified Communications Manager (SIP) - Manual (Page 71)

Customizing Your Phone
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The following figure shows the PIP when it displays over (“PIP” mode), rather
than next to, full screen video. (Depending on the video endpoint, you may or
may not see black bars.)
To update the way the PIP displays:
1. Tap > Settings > Basic > Video > Local Camera View.
The Local Camera View screen displays.