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From the CME prompt we instruct the router to download the firmware and unpack it onto our CME flash: When complete, the system’s flash will contain all 8 files extracted above.
Now we must configure CME’s tftp server to ‘serve’ these files so that the IP phones can request them.
Special consideration must be taken into account when upgrading to the latest firmware.
If the Cisco Unified IP phone is currently running firmware earlier than 6.0(2) on and you want to upgrade to 8.x(x), you must first install an intervening 7.0(x) load to prevent upgrade failure.
Cisco IP phone SCCP firmware files version 9.2., 7965 & 7975 IP phones (latest version at the time of writing this article) are available at our Cisco IP Phone & ATA Firmware Download section. When performing the factory reset procedure we are about to describe it is important to keep in mind that the IP phone will lose all configuration files and phone application.
This means that it is necessary to have Call Manager or Call Manager Express setup so that the IP phone will be able to receive the new information (phone application and configuration) after the reset procedure is complete, because it is likely the IP phone will not be usable until this information is loaded.
Assuming you can get the correct firmware copied to your tftp server, and your DHCP server is serving out Option 66 to tell the phones where to look for its config files (yes, these are mandatory requirements), then we can get into how to actually configure the phones themselves.
Press the Settings key, then 1 for User Preferences, then 2 for Background images, use the directional keypad to move to the image you want to use, then press the Select softkey, then press the Save softkey.
Your new background image will now display in all its glory.
Using the included files as a guide, we need to edit the following lines: This value is the number to dial to access the voicemail system.
On trixbox Pro this is 8555, on trixbox CE it is *97, for 3CX this is 999.