he Cisco Unified IP Color Key Expansion Module extends the capabilities of the Cisco Unified IP Phone 9971, 9951, and 8961 models with additional buttons and a color LCD display. This key expansion module adds 18 physical keys with access to 18 additional keys through the page keys for a total of 36 additional keys. You can connect up to three Cisco Unified IP Color Key Expansion Modules to the Cisco Unified IP Phone 9971, up to two key expansion modules to the Cisco Unified IP Phone 9951, and one key expansion module to the Cisco Unified IP Phone 8961.