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More Info:https://www.upcomnet.com/products/voice-over-e1-pcm-490.html
Available at:https://www.upcomnet.com/
E1-MUX16 This device is a desktop type which provides telephone outputs 1~16, Equipment electrical part for the whole digital circuits, machine reliability, stability, low power consumption, high integration, small size, easy installation and maintenance. Many customers are telecommunications operators E1 leased lines used in computer networking, this equipment can be rented at the E1 line opened a few road phones, you can make free calls between headquarters and branch offices of this.