About Grandstream GSC3518HS Outdoor 2 Way SIP Horn Speaker 50 Watt POE or 24-48V DC in

The Grandstream GSC3518HS is a rugged outdoor SIP/multicast talk-back horn speaker built for environments where announcements need to carry — and carry clearly. Packing a 50-watt speaker capable of reaching 126 dBA, IP66-rated weatherproofing, and three built-in microphones with AI noise reduction, it's a top-notch pick for campuses, warehouses, school grounds, hospitals, parks, and any large outdoor space that needs powerful, two-way public address. It's powered via PoE/PoE+/PoE++ or 24—48V DC, giving you flexible installation options wherever you need it.

Key Features

• 50W Horn Speaker — 126 dBA Output — Delivers high-fidelity audio at serious volume, covering expansive outdoor areas with clarity that cuts through ambient noise.
• Two-Way Talk-Back — Three built-in microphones with an 8-metre pickup range let people respond clearly, with AI-based background noise reduction ensuring every word gets through.
• SIP & Multicast Paging — Supports SIP paging, multicast paging, group paging, Push-to-Talk, and call waiting with priority override — making it easy to fit into your existing phone system or PBX.
• IP66-Rated Weatherproofing — Fully protected against dust and powerful water jets, with a durable stainless steel mounting bracket built for permanent outdoor installation in harsh conditions.
• Flexible Power Options — Accepts PoE, PoE+, or PoE++ via the network port, or 24—48V DC input — so you can power it the way that suits your setup.
• Versatile Audio Support — Full-band and wide-band codec support including Opus and G.722, plus LINE IN/OUT connections, AirPlay, ONVIF, RTSP/HTTP streaming, and local audio file playback.

Why Choose This Product?

If you need an outdoor paging solution that can genuinely be heard across a large site, the GSC3518HS delivers the goods. It's tough, flexible, and integrates cleanly with SIP-based phone systems. Our Telrexperts can help you work out the right placement, power setup, and configuration for your site.

What's in the Box

• Grandstream GSC3518HS Horn Speaker
• Stainless Steel Mounting Bracket & Mounting Kit
• Quick Installation Guide