Replacement of the standard Cisco Unified IP phone footstand is required. The standard footstand is replaced with a two-piece footstand specifically designed to support the Cisco Unified IP Phone Expansion Module 7916. Two footstands are available: a single footstand when one Cisco Unified IP Phone Expansion Module 7916 is used and a double footstand when two Cisco Unified IP Phone Expansion Module 7916 modules are used.