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Grandstream GBX20 Extension Module: Expand Your Communication PowerElevate your business communications and supercharge your productivity with the Grandstream GBX20 Extension Module. Designed for professionals who manage high call volumes, this powerful device transforms your Grandstream IP phone into a high-capacity command center. The GBX20 is the ideal solution for receptionists, executives, and call center agents who require instant access to a large number of contacts and streamlined call control at their fingertips. Say goodbye to fumbling through menus and hello to effortless efficiency.The centerpiece of the GBX20 is its large, vibrant 4.3-inch (480x272) TFT color LCD screen. This rich …