One less-than-perfect, but somewhat effective, short-term solution is to turn on the speakerphone. That exacerbates the 7100t's problem of noisiness on the other end, but gives you a better chance at hearing a soft-spoken caller. On occasion, I've used the speakerphone while more or less holding the unit up to my ear. It's sort of like turning on the hearing-impaired volume boost on an airport pay phone when a plane is taking off or the guy on the intercom is announcing yet another delay.
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