There are a few documents detailing how you can integrate Adobe Connect with an existing VCT deployment

Note that as of the time of writing this post (October 17th 2011) these options are only available for on-premise deployments of Connect, *not* on the SaaS/ASP

Connect 8 VCT Whitepaper
http://getconnect.adobeconnect.com/p5aqya9ilmg/
Configuring Flash Media Gateway (FMG) for VCT
http://getconnect.adobeconnect.com/p97h1kilhz9/
Here is a note form the Connect Users Forum from Guillaume Private at Adobe
With Adobe Connect 8, we support one way video integration with Video Conferencing System using H264 as the video codec and SIP as the signaling protocol.