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[https://remoteqth.com/img/wiki-spa301-1.jpg] * remove the pcb board from ip phone [https://remoteqth.com/img/wiki-spa301-2.jpg] * decompose hang up switch, and insulation [https://remoteqth.com/img/wiki-spa301-3.png] * apply circuit by [OK2ZAW\|https://ok2zaw.blogspot.cz/] - any P-chanel Mosfet (IRLML6402PBF) and NPN transistors (2N2222A) [https://remoteqth.com/img/wiki-spa301-4.jpg] * now IP phone picks up the call automaticaly. * 4p4c [Handset\|https://en.wikipedia.org/wiki/Modular_connector#Handset_wiring]{{ ------- \| ---\| tp389 mic +2V \| ---\| tp390 sp \| ---\| tp391 sp \| ---\| tp392 mic GND ------- }}

Auto hang up hack Cisco SPA301