Auto hang up hack Cisco SPA301

This revision is from 2013/03/24 16:47. You can Restore it.

by OK2ZAW

• remove the pcb board from ip phone

• decompose head hang up switch, and insulation

• 4p4c Handset

    -------
   |    ---|  tp389  mic +2V
  |     ---|  tp390  sp
  |     ---|  tp391  sp
   |    ---|  tp392  mic GND
    -------
  

• Hang up switch

   |
  o| n/c
  o| n/c
  o| 3,3V
  o| input
   |
  ----
      |
  eth |