LineSim 
This electronics construction project, produces a piece of equipment that you will discover to be indispensable.
Without using a telephone line, a full-featured telephone line simulator allows you to do all of the following:
  • Use your fax machine as a scanner or printer.
  • Couple two modem-equipped PCs for gaming or testing of communications software.
  • Test or demonstrate any device that connects to a telephone line:
    • Fax machine
    • Fax Switch
    • Modem
    • Answering Machine
    • Voice modem
    • Call recorder
    • Call diverter
    • Extension ringer
    • Telephone Ring booster
    • Security Autodialler etc.

Plus many other uses!
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