Grandstream GS-GXP2200EXT Expansion Module for VoIP Phone
This expansion module adds programmable buttons to compatible VoIP desk phones. It features a graphical display that shows clear status information for each button, making it ideal for receptionists, call center staff, and office administrators who manage multiple lines or extensions. Each module provides 20 physical buttons, with page-switching capability doubling that to 40 extensions per unit. Up to four modules can be connected together for a total of 160 programmable pounds