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Affordable 16 224 Ports Full Duplex Small Business PBX Telephone Exchange. Flexible Port Expansion: Supports 16 to 224 ports to adapt to business growth. Full Duplex Transmission: Ensures clear, interference-free analog voice calls. Modular Structure Design: Allows for easy upgrades and daily maintenance. Compact Space Saving Design: Fits any office environment including hotels and factories. 12-Month Full Unit Warranty: Includes 100% factory inspection for all units. Free Usage Guide: Provides free manual and installation videos. ODM Service Available: Offers full customization, minor customization, and design-based options. ISO Certified Quality: Manufactured under ISO9001, ISO14001, and ISO45001 standards.