You can't withdraw cash with it, but if you pay toll charges to make school-to-school telephone calls, a new asynchronous transfer mode (ATM) application could give you savings you can bank on.

Sphere Communications Inc., a communications company in Lake Bluff, Ill., uses new ATM technology to take the high cost out of in-district toll calls. Its product, dubbed Sphericall, allows you to use your high-speed data network to give your school system high-quality internal telephone service.

Sphericall, which runs from computer software, was created for small businesses and is now being targeted to schools. Sphere Communications claims you can use its


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