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