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Professional 16 224 Ports Analog Small Business Voice PBX Telephone Exchange. Flexible Port Expansion: Supports 16 to 224 ports to adapt to business growth. Modular Structure Design: Ensures easy upgrade and daily maintenance. Full Duplex Transmission: Provides stable and clear interference-free voice calls. Compact Space Saving: Fits any office, hotel, or factory environment. 12-Month Warranty: Includes 100% factory inspection and full unit coverage. Free Usage Guide: Comes with free manual and installation videos. Full Customization: Offers customization from samples, designs, and minor adjustments. ISO Certified Quality: Manufactured under ISO9001, ISO14001, and ISO45001 standards.