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Closed captioning data for MPEG-2 video files?

Is it possible to encode closed-caption data on an MPEG-2 video file that is played out on Cablecast? I know about the VBI capture for video encoding, but I want to know if Cablecast can play out Line 21 captions given data in the MPEG-2 stream or via an .scc file.

We have a PSA we want captioned and need to know this before doing the work or sending it out.
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