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Downloading Firmware into 7975 from CUCM

                   Hello All,

I have Issues with a 7975 IP phone downloading firmware and registering with call manager 7.1. The IP Phone is for cts 1300 and its new whenever i connect to the cucm its shows the file SIP.75.9-0-2SR1S to be downloaded but suddenly shows Auth fail , it keeps showing the same all over. Please what do you think can be done to make me the phone register with the call manager. or is there another way that I can load the firmware into the phone without connecting to the call manager.

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Downloading Firmware into 7975 from CUCM

Search for "Auth fail" here and you will find many similar posts.

It is either that your current firmware is too old and you need 2 steps upgrade, or it may be ITL cert issue.

HTH,

Chris

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