--- title: Grandstream GSC3518HS Outdoor SIP Talk-Back Horn Speaker description: Grandstream GSC3518HS is an IP66 outdoor SIP/multicast talk-back horn speaker with 50W output, up to 126 dBA max volume, and PoE power. image: https://blog.streakwave.com/hubfs/Grandstream/2026/GSC3518HS.jpg --- [![streakwave logo-1](https://blog.streakwave.com/hubfs/streakwave%20logo-1.png)](https://www.streakwave.com) - Product - [Wireless](https://www.streakwave.com/wireless-3) - [3G/4G/LTE](https://www.streakwave.com/3g4glte-2) - [Antennas](https://www.streakwave.com/antennas-3) - [LoRaWAN](https://www.streakwave.com/lorawan-3) - [Point to Multipoint (PTMP)](https://www.streakwave.com/point-to-multipoint-ptmp-3) - [Point to Point (PTP)](https://www.streakwave.com/point-to-point-ptp-3) - [WiFi / Hotspot](https://www.streakwave.com/wifi-hotspot-4) - [Voice and Video](https://www.streakwave.com/voice-and-video-3) - [Audio Loggers](https://www.streakwave.com/audio-loggers-3) - [EnGenius Durafon](https://www.streakwave.com/engenius-durafon-3) - 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February 26, 2026 --- Grandstream has expanded its GSC Series with the GSC3518HS Outdoor Horn Speaker, built for loud, clear paging in outdoor and high-noise environments. [In their recent press release](https://blog.grandstream.com/press-releases/grandstream-adds-outdoor-horn-speaker-to-gsc-series), Grandstream positions the GSC3518HS as a SIP-based option for wide-area notifications and talk-back communication across larger sites. The GSC3518HS combines SIP + multicast paging with talk-back audio, making it a practical fit for campuses, warehouses, public venues, and industrial facilities—anywhere announcements need to carry and stay intelligible in real-world conditions. ## [![GSC3518HS](https://blog.streakwave.com/hs-fs/hubfs/Grandstream/2026/GSC3518HS.jpg?width=786&height=658&name=GSC3518HS.jpg)](https://streakwave.com/grandstream-gsc3518hs-outdoor-2-way-sip-horn-speaker-50w) ![Grandstream GSC3518HS Outdoor 2 Way SIP Horn Speaker 50W](https://blog.streakwave.com/hubfs/Grandstream/2026/0060014_grandstream-gsc3518hs-outdoor-2-way-sip-horn-speaker-50w.png) ### [Grandstream GSC3518HS Outdoor 2 Way SIP Horn Speaker 50W](https://streakwave.com/grandstream-gsc3518hs-outdoor-2-way-sip-horn-speaker-50w) GRA-GSC3518HS MSRP: $319.00 [Log In for Your Price](https://streakwave.com/grandstream-gsc3518hs-outdoor-2-way-sip-horn-speaker-50w) ## **Key Features** - **High-output outdoor paging:** 50W horn speaker with up to **126 dBA** max volume for wide-area announcements in noisy environments. - **Outdoor-rated durability:** **IP66** protection plus a **stainless-steel mounting bracket** for permanent installs exposed to dust, rain, and spray. - **Two-way talk-back audio:** Built-in **3-mic array** with **AI noise reduction** to help the person speaking be heard more clearly during live talk-back. - **SIP + multicast paging options:** Supports **SIP paging**, **multicast paging**, **group paging**, and **priority override** so urgent messages can cut through. - **Simplified power + deployment:** **PoE/PoE+/PoE++ input** with **PoE/PoE+ output** and dual 10/100 ports—useful for cleaner cabling and streamlined installs. - **Integration-friendly audio:** **Line in/out** connections and support for common streaming/playback methods (useful when tying into broader AV/security workflows). ## Use Cases The GSC3518HS is a strong choice for wide-area outdoor announcements in busy environments—like school grounds, yards and loading areas, industrial sites, and public spaces. It also fits well at gates, entrances, and perimeter locations where you want both paging and talk-back communication as part of a SIP/multicast system. [ Download Full Details (PDF)](https://blog.streakwave.com/hubfs/Grandstream/2026/Datasheet_GSC3518HS_English.pdf) **Ready to add outdoor paging to your next deployment?** [View the Grandstream GSC3518HS](https://streakwave.com/grandstream-gsc3518hs-outdoor-2-way-sip-horn-speaker-50w) at Streakwave. [Grandstream](https://blog.streakwave.com/tag/grandstream) [Product Spotlight](https://blog.streakwave.com/tag/product-spotlight) ### The Latest Posts From Grandstream [Meet, Chat, and Collaborate with Grandstream Wave](https://blog.streakwave.com/meet-chat-and-collaborate-with-grandstream-wave) June 9, 2026 [Free Cloud Management with Grandstream GDMS](https://blog.streakwave.com/free-cloud-management-with-grandstream-gdms) June 8, 2026 [Grandstream Solutions for Multi-Dwelling Unit Deployments](https://blog.streakwave.com/grandstream-solutions-for-multi-dwelling-unit-deployments) June 1, 2026 [Grandstream GWN7670 Series: Wi-Fi 7 for Flexible, High-Performance Deployments](https://blog.streakwave.com/grandstream-gwn7670-series-wi-fi-7-for-flexible-high-performance-deployments) May 6, 2026 ## Similar posts Product Announcements ### [Grandstream Releases Latest Intercom & Facility Access Control Stations](https://blog.streakwave.com/grandstream-releases-latest-intercom-facility-access-control-stations) September 5, 2024 Grandstream ### [Grandstream GWN7605CLR: Outdoor Wi-Fi, flexible power](https://blog.streakwave.com/grandstream-gwn7605clr-outdoor-wi-fi-flexible-power) February 27, 2026 Grandstream ### [Grandstream GWN7302: A Practical Fixed Wireless Bridge for Outdoor Links](https://blog.streakwave.com/grandstream-gwn7302-a-practical-fixed-wireless-bridge-for-outdoor-links) February 19, 2026 Product Announcements ### [New from Grandstream: Stay Connected Anywhere with the DP735 Ruggedized DECT Handset](https://blog.streakwave.com/new-from-grandstream-stay-connected-anywhere-with-the-dp735-ruggedized-dect-handset) November 25, 2024 Product Announcements ### [New from Grandstream: GRP2613W Carrier-Grade IP Phone with Wi-Fi 6](https://blog.streakwave.com/new-from-grandstream-grp2613w-carrier-grade-ip-phone-with-wi-fi-6) October 23, 2024 Grandstream ### [Meet, Chat, and Collaborate with Grandstream Wave](https://blog.streakwave.com/meet-chat-and-collaborate-with-grandstream-wave) June 9, 2026 ### Stay up-to-date on the latest content from Streakwave. 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