Polycom VVXTM 1500 - Manual (Page 70)

User Guide for the Polycom VVX 1500 Phone
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The following figure shows the PIP disabled in full screen mode. (Depending
on the video endpoint, you may or may not see black bars.)
The following figure shows the PIP when it displays next to (“side-by-side”
mode), rather than over, full screen video.