Does IIS support CEA-608 closed caption conversion?

Question

Does IIS support CEA-608 closed caption conversion?

I am using IIS Smooth Streaming stuff (.isml) to deliver a video stream to a Silverlight plugin and IOS devices using IIS HLS re-encoding on the fly. Also I am sending "Closed Captions" live - it works fine on the Silverlight plugin, but the HLS stream does not display closed captions. Is it possible that IIS is forgetting about the text stream in the original .isml stream?

Playlist example

#EXTM3U
#EXT-X-VERSION:1
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=581120,RESOLUTION=276x208
QualityLevels(560000)/manifest(format=m3u8-aapl).m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=781432,RESOLUTION=364x272
QualityLevels(756000)/manifest(format=m3u8-aapl).m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1078834,RESOLUTION=480x360
QualityLevels(1047000)/manifest(format=m3u8-aapl).m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=167920
QualityLevels(160000)/manifest(format=m3u8-aapl).m3u8

#EXTM3U
#EXT-X-VERSION:1
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:12,no-desc
Fragments(Video=0,format=m3u8-aapl).ts
#EXTINF:11,no-desc
Fragments(Video=100000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=200000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=300000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=400000000,format=m3u8-aapl).ts
#EXTINF:11,no-desc
Fragments(Video=600000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=700000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=800000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=900000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=1000000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=1200000000,format=m3u8-aapl).ts
#EXTINF:11,no-desc
Fragments(Video=1300000000,format=m3u8-aapl).ts
#EXTINF:12,no-desc
Fragments(Video=1400000000,format=m3u8-aapl).ts
#EXTINF:7,no-desc
Fragments(Video=1500000000,format=m3u8-aapl).ts
#EXT-X-ENDLIST