Polycom DOC2560C - Manual (Page 178)

Chapter 3-Basic Operation
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The Video Force sub menu is displayed.
2 Use the Up/Down/Left/Right arrow keys to select the window of the
video layout that you want the specific participant to be displayed in.
3 Press the Zoom In key to cycle the display of all participants in the
selected video window until the participant you want to be displayed
appears.
4 Press the Right arrow or # key to confirm your selection.
Recording
This function is not available to chairpersons using PCM with ISDN
endpoints.
If a Recording Link has been set up in the Conference Profile, the conference
chairperson can use the PCM interface to start, pause, resume and stop
recording. If no Recording Link exists, this function appears grayed out and
cannot be selected.