Auto hang up hack Cisco SPA301

This revision is from 2013/03/24 18:01. You can Restore it.

• remove the pcb board from ip phone

• decompose head hang up switch, and insulation

• apply circuit by OK2ZAW - any P-chanel Mosfet (IRLML6402PBF) and NPN transistors (2N2222A)

• now IP phone hang UP automaticaly after call.

• 4p4c Handset

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