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Dedicated push-to-talk button
please purchase the required Yealink WF40 Dongle
3" color display
all without compromising mobility
providing an ultra-lightweight design
Grandstream GBX20 Expansion Module VoIP Adapters Dedicated push-to-talk buttonThe 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
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