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E&M pinout

in 4 wire operation according to the document: r(pin 3) and t(pin 6) are audio input r1(pin 4) and t1(pin 5) are audio output but i can use a cisco rollover cable to connect to e&m ports back to back that says input pair connecting to input pair, output pair connecting to output pair, and it is ok for this connection. why? that is not reasonable!!!

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