Auto picks up call hack - Cisco SPA301
This modified IP phone for automatic picks up call on the TRX side of remote.
- remove the pcb board from ip phone
- decompose hang up switch, and insulation
- apply circuit by OK2ZAW - any P-chanel Mosfet (IRLML6402PBF) and NPN transistors (2N2222A)
- now IP phone picks up the call automaticaly.
Cisco SPA301 connectors(Edit)
- 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 |