Put this item as used because it was hooked up and used on there system but the company needed a different version,great item works and tested see pictures.

The Grandstream GXW4501 Digital VoIP Gateway is a reliable GSM gateway manufactured by Grandstream in China. This model is designed to provide efficient communication services for businesses and offers a seamless integration of IP PBX systems. With its tested functionality and included accessories, this product ensures a smooth and high-quality digital voice transmission experience for users.