With the new People+Content from Polycom they claim that their new cameras can stream to Cisco IP/Tv I have yet to try it out though.
There are a couple ways to do this:
1. you can take the video output from a client and attach it directly to the encoder in an IP/TV server.
2. You can use a third party product such as starback to join the conference and serve the VC session up as a broadcast stream.
Certain H.323 vendors have enabled this feature - most specifically Tandberg and VCON. Both support SDP multicast advertisements that either the IPTV content manager or viewer can receive. H.261 is a codec that IPTV viewers can decode. This content can either be archived to an IPTV server or viewed live.
Basically, you stream from the Polycom FX/4000 as an RTP broadcast. (It streams the mixed audio and the video of the dominant speaker.) Define it as a Server in the CM. Create a Live program on a Channel matching the UDP parameters of the RTP traffic (hint, H.261/pcm). View the stream on the IPTV viewer or Record to an Archive/Broadcast Server.