![]() We saw what information is lost during the reset, how to configure Cisco CallManager Express TFTP Server so that the updated SCCP firmware is automatically loaded on the IP phones and how to verify the IP phone firmware after the upgrade is complete.Factory reset erases all the customer-specific data stored in a device and restores the device to its original configurationĪt the time of shipping. This article explained how to perform a factory reset for Cisco IP phones 7975, 7965 & 7945 models. The firmware can be verified by going to the phone Settings / Model Information menu option, where the load file installed is shown: The IP phone should now be ready for use with the new IP phone firmware installed. ![]() Once complete, the IP phone will install the files and finally rebootīelow is a screenshot of our 7945 IP phone during the firmware upgrade process: The IP phone should first obtain the “loads” file and then proceed with the individual files. This "loads" file indicates all the files the IP phone has to download from the TFTP server to make up the device firmware. The phone then tries to obtain the appropriate file depending in its model: This is why these DHCP options are critical at this phase. The IP phone also expects the IP address ( option 150) or the name ( option 66) of the TFTP server to be delivered by the DHCP server. When complete, the IP phone will reboot and the bootloader will try to obtain an IP address via DHCP. This process can take several minutes and the firmware of the IP Phone will be erased.
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