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Information on how to configure CallManager Express to upgrade your IP phone, can be found in our Cisco CallManager Express Setup for IP Phone Firmware Upgrade article.
To learn how to reset your Cisco 7975G IP phone to factory defaults, read our Cisco IP Phone 7945, 7965, 7975 Factory Reset Procedure article.
SCCP Firmware Version: 9.3.1
Contains 7975 SCCP security enhancement v9.3.(1) SR2 - 11 Feb 2013.
SIP Firmware Version: 9.2.1
Included in CME version: 9.1, 8.8