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Reliable Commercial Modular Full Duplex Office 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: Easy upgrade and daily maintenance structure. Compact Space Saving: Fits any office, hotel, or factory environment. 12-Month Warranty: Full unit warranty with 100% factory inspection. Free Installation Guide: Includes free manual and installation videos. ODM Service Available: Offers full customization, design, and sample-based options. ISO Certified Quality: Manufactured under ISO9001, ISO14001, and ISO45001 standards.