Grandstream’s GSC Series of SIP Speakers delivers flexible, network-based paging, intercom, and public-address solutions for offices, schools, hospitals, hotels, MDUs, campuses, warehouses, and other large facilities. The GSC3518HS is a high-powered, IP66-rated outdoor speaker designed for wide-area announcements and two-way talk-back communication, while the GSC3516 combines high-quality two-way audio, directional microphones, Wi-Fi, and multicast paging for indoor communication environments. The GSC3506 v2 is a powerful 30W SIP/multicast paging speaker focused on one-way announcements, alerts, and facility-wide public-address applications. Together, these speakers provide scalable communication options with features such as SIP calling, multicast/group paging, PoE, PTT, and advanced audio capabilities, making them suitable for a wide range of modern facility communication deployments.