Expansion modules add keys to compatible phones, giving power-users additional feature keys, speed-dial keys, or quick action keys. Expansion modules are also known as attendant consoles or phone side-cars. They are designed to fit with the style of the base phone, and might feature color LEDs to indicate status or self-labeling LCD screens for simpler updating through your phone system. Many modules can be powered through the base phone using PoE (Power over Ethernet), while others require a separate power supply.
Find certified expansion modules from the leading manufacturers of IP phones, including Polycom, Cisco, Yealink, and VTech.