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The Grandstream HT503 is an analog telephony adapter with one FXO port and one FXS port. It also includes two Ethernet ports and a built-in NAT router. The small size of the Grandstream HT503 is ideal for transporting the device or setting it up inconspicuously on a desktop. LED indicators provide real-time statuses of the ports and the power supply, and the Grandstream HT503 is manageable via a web-based GUI.