Polycom Webcam - Manual (Page 244)

ViewStation EX User Guide
242 www.polycom.com
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Closed Caption works in IP (H.323) and ISDN (H.320) calls.
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Closed Caption is only supported when the call occurs between
two Polycom ViewStation SP, MP, V.35/RS-449/RS-530, or 512
systems running version 6.5 or greater, and FX or VS4000
systems running software version 2.5 or greater.
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Closed Caption is not supported in multipoint calls.
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The Closed Caption feature requires that you enter your name
(and Meeting Password if you have one) after a call is started or
after a call is hung up. You might have to refresh your browser
if you hang up the call and you use Closed Caption out of a call.