Cmterm7975sip942sr4zip 2021 〈Trusted Source〉

Restart the Device: The phone will detect the new load on the TFTP server and begin the multi-stage upgrade process. Common Troubleshooting Issues

: Update the "Device Defaults" in CUCM to the new load name (e.g., SIP75.9-4-2SR4S cmterm7975sip942sr4zip 2021

Authentication Error: If the phone displays an authentication error during the upgrade, ensure that the ITL (Identity Trust List) file on the phone is current. You may need to manually delete the ITL file from the phone's security settings to allow it to download the new firmware. Restart the Device: The phone will detect the