Upgrades are usually smooth, but when they're not, these are the common culprits.
Access to better user interface features or improved codec support. 2. Identifying Your Current Firmware Version Cisco Ip Phone 7965 Firmware Download
You cannot simply download the first file you find. You must identify two things: Upgrades are usually smooth, but when they're not,
: Skinny Call Control Protocol, primarily for Cisco CallManager environments. Upgrades are usually smooth