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Easy Maintenance Modular 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 Design: Enables easy upgrades and daily maintenance. Compact Space Saving: Fits any office, hotel, or factory environment. 12-Month Warranty: Includes 100% factory inspection and full unit coverage. Free Usage Guides: Provides free manuals and installation videos. ODM Service Available: Offers full customization, design-based, and minor customization. ISO Certified Quality: Manufactured under ISO9001, ISO14001, and ISO45001 standards.