Grandstream GSC3516 SIP Talk-Back Speaker with 15W Audio, 4 Mics

The Grandstream GSC3516 is a SIP and multicast talk-back speaker with a 15W HD driver, three beamforming mics and an auxiliary mic that reach 4.2 m. It is meant for halls, corridors and waiting areas in schools, hospitals and offices that need more volume than the smaller models.

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When a room is large or noisy, an 8W speaker runs out of headroom. The Grandstream GSC3516 is a SIP and multicast talk-back speaker that pairs a 15W HD driver with three beamforming microphones and an omnidirectional auxiliary mic, picking up voices from as far as 4.2 m. It runs on a single PoE+ cable, adds 802.11ac Wi-Fi and Bluetooth, and supports up to 16 SIP accounts.

Grandstream GSC3516 specifications

• 15W speaker, up to 90 dBA sensitivity at 1W/0.5 m.
• 3 directional beamforming mics plus 1 omnidirectional auxiliary mic, 4.2 m pickup.
• Full-band audio at 48 kHz sampling with echo cancellation, noise suppression and automatic gain control.
• One 10/100 Mbps port, PoE 802.3af Class 3 or PoE+ 802.3at Class 4.
• Dual-band Wi-Fi 802.11a/b/g/n/ac, Bluetooth 2.1 EDR and 5.0.

Every paging mode you need

The GSC3516 handles direct SIP paging, multicast paging on up to 10 addresses with priorities 1 to 10, group paging and push-to-talk. Call waiting with priority override lets an urgent page take over from a routine call. A Bluetooth headset or device can join calls through Bluetooth SCO.

Clear speech in big rooms

Volume alone does not fix a large hall, because echo smears speech. The GSC3516 combines acoustic echo cancellation, noise suppression and automatic gain control with beamforming that steers the mics toward whoever is talking. Wideband G.722 and Opus are supported, alongside G.711, G.729A/B and G.723 for compatibility with different PBXs and SIP trunks.

Management and security

Manage it from Grandstream's GDMS cloud platform, through TR-069 or with encrypted XML files, which matters when a project has dozens of units. Secure boot, 256-bit AES encrypted configuration files, TLS, SRTP and 802.1x protect the device, and allow, block and grey lists filter who can call it.

Where it works best in Saudi Arabia

• School halls and theatres: announcements from the administration, replies from the stage.
• Waiting lounges in hospitals and health centers.
• Hotel corridors and office tower lobbies.
• Showrooms and exhibition spaces that need extra volume.

Mounting and compatibility

Wall mounting uses a metal bracket that the unit twists onto; ceiling mounting needs an 18 mm cable hole, and an anti-theft screw locks the speaker in place. It measures 257 mm across and 68.5 mm deep, and weighs 0.92 kg. As a standard SIP endpoint it registers on UCM and other SIP PBXs, and Grandstream pairs it with its IP phones and GDS door systems.

GSC3516, GSC3510 or GSC3506 V2?

The GSC3510 is also two-way but uses an 8W speaker, three mics, 802.11n Wi-Fi and Bluetooth 4.0 in a 215.32 mm housing. The GSC3506 V2 is a 30W ceiling speaker for announcements only, with no microphone and no Wi-Fi. Pick the GSC3516 when you need two-way conversation with more volume than the GSC3510 delivers.

Frequently Asked Questions

How does the GSC3516 differ from the GSC3510?

It has a 15W speaker instead of 8W, four mics instead of three, 802.11ac Wi-Fi and Bluetooth 5.0, and its datasheet adds group paging and push-to-talk. Both pick up voices up to 4.2 m.

Is a standard PoE switch enough?

Yes. It runs on PoE (802.3af Class 3) or PoE+ (802.3at Class 4), so any switch port offering either standard will power it.

Can it be managed remotely?

Yes, through Grandstream GDMS, TR-069 or encrypted XML files, with firmware updates over HTTP, HTTPS or TFTP.

Specifications

• Model: GSC3516
• Series: GSC3500 Speakers
• Type: SIP/multicast talk-back speaker
• Protocols/standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, DNS (A/SRV/NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, LLDP-MED, SIMPLE, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6, OpenVPN
• Network interface: 1× 10/100 Mbps port with integrated PoE/PoE+
• Operating system: Linux
• Bluetooth: Integrated, Bluetooth 2.1 + EDR and Bluetooth 5.0
• Wi-Fi: Dual-band 2.4/5 GHz, 802.11a/b/g/n/ac
• Auxiliary port: 1× 2-pin multi-purpose input, reset
• Voice codecs and processing: G.711µ/a, G.722, G.726-32, iLBC, Opus, G.723, G.729A/B; in-band, RFC2833 and SIP INFO DTMF; VAD, CNG, AEC, PLC, AJB, AGC, ANS
• Telephony features: SIP paging, multicast paging, group paging, PTT, call waiting with priority override, Bluetooth SCO calling
• SIP accounts: Up to 16
• Multicast paging: Up to 10 listening addresses, priority 1 to 10 (sender and speaker on the same LAN)
• HD audio: Full-band HD speakerphone, 48 kHz sampling
• Speaker: 15W HD, up to 90 dBA at 1W/0.5m
• Microphones: 3 directional beamforming mics + 1 omnidirectional auxiliary mic, 4.2 m pickup
• QoS: Layer 2 (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)
• Security: User/admin passwords, MD5/MD5-sess, 256-bit AES encrypted config, TLS, SRTP, HTTPS, 802.1x, secure boot, allow/block/grey lists
• Languages: English, German, French, Spanish, Portuguese, Russian, Chinese
• Upgrade/provisioning: Firmware via TFTP/HTTP/HTTPS or local upload; mass provisioning via GDMS/TR-069 or encrypted XML
• Power: PoE 802.3af Class 3, PoE+ 802.3at Class 4
• Storage temperature: -10°C to 60°C
• Humidity: 10% to 90% non-condensing
• Dimensions: 257 mm diameter × 68.5 mm depth
• Weight: 0.92 kg
• Mounting: Wall (twist-lock metal bracket) or ceiling (18 mm cable hole), M3 × 50 anti-theft screw
• Compliance: FCC Part 15 (Subparts B, C, E), IC, CE, UKCA, RCM
• In the box: GSC3516 speaker, mounting kit (metal and plastic brackets, wiring seat, hang-rope plate, screws, anchors, M3 nuts), quick installation guide

Features

• 15W HD speaker with up to 90 dBA sensitivity: sound that reaches the back of a hall or corridor.
• 3 beamforming mics plus an auxiliary mic with 4.2 m pickup: answer from anywhere in the room.
• SIP, multicast and group paging plus push-to-talk: page one speaker or the whole building.
• Dual-band 802.11ac Wi-Fi and Bluetooth 5.0: take calls through a Bluetooth headset or device (SCO).
• PoE/PoE+ with GDMS management and secure boot: one cable to install, one console for dozens of units.