The Grandstream GBX20 is a programmable key expansion module built for receptionists and high-call-volume users who need to manage more lines than a standard phone display allows. It attaches directly to compatible Grandstream desk phones.
Features include:
4.3" color LCD with 20 keys per page
Up to 40 contacts per module, 160 with 4 daisy-chained modules
BLF, call park/pickup, and speed dial support
Powered through the host phone
Automatic firmware updates via host phone
Manage more extensions at a glance with the GBX20.
