I've a batch of 7912G phones we've deployed within our organisation. Most have worked fine, however we have a dozen or so that when powered on are sat there with RED and GREEN amber lights on and nothing showing on the display.
Any ideas how i can reset them to facotry defaults or something similar.
Most of the TAC cases I searched resulted in a RMA of the 7912.
I might be that the phone failed to upgrade and fell back to recovery mode.
You can verify if the phone is in recovery mode by taking a Wireshark trace and read the note below.
Here are some notes about the recovery mode:
The Cisco 7912 IP phone can automatically detect and recover from corruption in its stored software. Software corruption rarely occurs but may occur when there is a momentary or complete loss of power during the software upgrade process. When this condition is detected, the Cisco 7912 IP phone is designed to automatically request a file named *cp7912r.zup, *which can be any Cisco 7912 IP phone software image. It is recommended that you make a copy of any firmware image version and name it *cp7912r.zup* to keep this automated software recovery feature.
To take advantage of this feature, the Cisco 7912 IP phone must be configured to use a TFTP server and the file named *cp7912r.zup *must be available for download from the TFTP server.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.