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The answer is apparently the ESS1688 is half duplex. See http://www.esstech.com/techsupp/featur_comp.html for details. Tom Franklin <tom.franklin@usa.net> wrote in article <01bc8aa1$28cb2160$e2e72581@tom-s-laptop>... > Has anyone got full-duplex working on the ESS1688 sound chip used in the > Thinkpad 760, TP560, and TP380? I have the latest IBM drivers and it only > allows half duplex. > > I am trying to get MS Netmeeting to allow phone calls over the internet, > but half-duplex is painful. I would think modern sound chips would allow > full duplex.