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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.
It needs to download it’s config on every boot, so you will always need a TFTP server running.
According to Cisco, when initiating a factory reset procedure certain information from the IP phone is erased while other information is reset to the factory default value, as shown in the list below: Information Erased: It is highly advisable to follow the firmware upgrade procedure in a non-working environment to ensure other phones are not affected (in case of an accidental reboot), and to avoid the freshly factory reset ip phones obtaining the working environment’s settings.
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.
Recently we had a pack of cisco 7942G phones that we were required to get them up running with Asterisk.
The good thing about 79XX series is that they all support SIP besides SCCP.