Converting a Cisco 7960/7940 to SIP
Converting a Cisco 7960/7940 to SIP
Reset Cisco 7960/7940 to factory:
pull power cable, press and hold the # key while inserting power cable,
dial 1,2,3,4,5,6,7,8,9,*,0,# and answer 2.
Additional Cisco info: http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080094584.shtml#topic1a