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High Quality Compact Analog Small Business Voice 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: Facilitates easy upgrades and daily maintenance. Compact Space Saving: Fits any office, hotel, or factory environment. Comprehensive Warranty: 12-month full unit warranty with 100% factory inspection. Free Usage Guide: Includes free manual and installation videos. Full Customization Options: Offers full customization, customization from samples, designs, and minor customization. ISO Certified Quality: Manufactured under ISO9001, ISO14001, and ISO45001 standards.