Sometimes when something went wrong or you just you to do some tests on your Cisco IP Phone you may want to reset it to factory settings . To do that you need to follow some easy steps and you just need to use a POE cable or a 48V source adapter. This tutorial applies to a wide variety of Cisco IP Phones like Cisco 7940, 7941, 7942, 7960, 7961, 7962, 7920 or 7821 . The following data will be erase...