Speakerphones for Conference Calls

I get involved in a lot of conference calls, and I've found that all speakerphones have one thing in common: They simply don't work. Unless all conferers are huddled within three feet of a squawk box, they sound like they're gargling at the bottom of a well. I can't hear spokesfolk who turn away, walk around the room or, as often happens, hold their hands over their mouths simulating laughter while pointing at the speakerphone.

Then there's the duplicity of the term "full-duplex." It's supposed to mean both parties can give and take as freely as on a telephone. No way. With the usual less-than-full-duplex hardware, my fellow gabbers can't hear me interrupting unless they shut up--greatly reducing my opportunities to badger and pontificate. On their end of the line, it's tough to place a tethered speakerphone where everyone can gather around comfortably.