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High Performance Full Duplex 16 224 Ports Modular 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: Fits any office, hotel, or factory environment. Comprehensive Warranty: Includes 12-month full unit warranty and 100% factory inspection. Free Usage Guides: Provides free manuals and installation videos. Advanced Certifications: ISO9001, ISO14001, ISO45001, and CCC certified. OEM/ODM Customization: Offers full customization, design customization, and sample-based options.