Motorola / AMPS handset specifications:
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RJ-45       DB-25        Description

-----       -----        -----------

  1           23            ground

  2            8             9.5 V

  3           11         3-wire databus "true"

  4           12          complimentary line

  5           18          return data line

  6           24            audio ground

  7            1           rcv hi

 

