AIVMS would likely work for this purpose, but it interfaces to a Winamp client connected to Shoutcast via DSP rather than SAM at the current time.
AIVMS is an artificial intelligence that functions as an automated DJ. The AI will introduce the songs in your mp3 collection using fully customizable intro's. It can also obtain information about the artist on-the-fly from the internet, and use this info within the song introduction. It controls a Skype client, and will automatically answer incoming calls, which it then routes to the internet broadcast stream.
You can
download AIVMS and try it out for yourself.
I am not sure if AIVMS would work for conference calls at this time, but that sure is an interesting idea. If not, it should be pretty easy to implement, so I will suggest this to our project developers. It does work quite well for routing a single incoming call to the broadcast stream, a live request line for example, and it does this using nothing but the existing hardware on your PC.