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.
