Grandstream GSC3510 Two-Way SIP Intercom Speaker with 3 Mics

The Grandstream GSC3510 is a full-duplex SIP intercom speaker that combines an 8W speaker with three directional microphones reaching 4.2 m. It suits classrooms, patient rooms and staff housing that need voice contact with an office or front desk without a phone on the desk.

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Need staff in a classroom or patient room to answer back without walking to a phone? The Grandstream GSC3510 is a SIP intercom speaker that delivers full two-way audio through an 8W HD speaker and three directional microphones that pick up voices up to 4.2 m away. One PoE cable powers it, and it registers on your PBX like any other extension.

What makes the Grandstream GSC3510 different

The microphones. Three beamforming mics focus on the person talking, while acoustic echo cancellation and noise suppression keep the conversation clean even when the speaker stands in the middle of the room.

• Full-duplex two-way audio with 48 kHz sampling.
• 8W HD speaker.
• 3 directional microphones, 4.2 m pickup.
• Multicast paging on up to 10 addresses.
• 10/100 Mbps port with PoE/PoE+, dual-band Wi-Fi, Bluetooth 4.0.

Intercom and paging in one unit

Calls from reception or a control room can be set to auto-answer, so the conversation starts hands-free. The same unit listens on up to 10 multicast addresses with priorities 1 to 10, so school-wide or hospital-wide announcements still reach it. The web interface adds outgoing calls, call history and click-to-dial from contacts, a section the user manual lists for the GSC3510 only.

Ports and size

Around the back you get an RJ45 PoE port, a 2-pin multi-purpose input for a push button or alarm sensor, and a factory reset button. It measures 215.32 mm across and 68.7 mm deep, and weighs 0.8 kg.

Audio and security

Wideband G.722 and Opus sit alongside G.711, G.729A/B and iLBC, with automatic gain control and packet loss concealment to keep speech steady. Whitelists and blacklists decide who may call the unit, so random calls never reach a patient room or classroom.

Typical uses in Saudi Arabia

• Schools: the deputy principal talks to a classroom, and the teacher replies from the whiteboard.
• Hospitals and clinics: patient or isolation rooms reach the nursing station.
• Student and staff housing: rooms connect to the supervisor or front desk.
• Warehouses: the guard room calls the site office.

Compatibility

Standard SIP (RFC3261) means it registers on Grandstream UCM systems and other SIP PBXs. Grandstream also lists integration with its IP phones and GDS door systems. Provisioning works over TFTP, HTTP or HTTPS, or with encrypted XML files when you deploy many units at once.

GSC3510, GSC3516 or GSC3505?

The GSC3505 is the same unit without microphones, so it only plays announcements. The GSC3516 is also two-way but steps up to a 15W speaker, adds a fourth auxiliary mic, moves to 802.11ac Wi-Fi and grows to 257 mm across. Choose the GSC3510 for small and mid-size rooms, and the GSC3516 for larger or noisier spaces.

Frequently Asked Questions

How is the GSC3510 different from the GSC3505?

The GSC3510 adds three directional mics with 4.2 m pickup for two-way talk; the GSC3505 is announcement-only. Both share the 8W speaker and housing.

Can the GSC3510 answer calls automatically?

Yes. Auto answer starts the conversation hands-free, which suits classrooms and patient rooms.

How is it powered?

By PoE (802.3af) or PoE+ (802.3at) from a PoE switch or injector; the datasheet lists no other power input.

Specifications

• Model: GSC3510
• Series: GSC3500 Speakers
• Type: Two-way full-duplex SIP intercom speaker/microphone
• Protocols/standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, DNS, DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP-MED, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6, OpenVPN
• Network interface: 1× 10/100 Mbps port with PoE/PoE+
• Wi-Fi: Dual-band 2.4/5 GHz, 802.11a/b/g/n, WMM
• Bluetooth: Integrated, Bluetooth 4.0 + EDR
• Auxiliary port: 1× 2-pin multi-purpose input, reset
• Voice codecs and processing: G.711µ/a, G.722, G.726-32, iLBC, Opus, G.729A/B; in-audio, RFC2833 and SIP INFO DTMF; VAD, CNG, AEC, PLC, AJB, AGC, ANS
• Telephony features: SIP paging, multicast paging, call waiting with priority override, auto answer, transfer, hold, call log, click-to-dial from contacts
• 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: 8W HD speaker
• Microphones: 3 beamforming directional mics, pickup up to 4.2 m
• QoS: Layer 2 (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)
• Security: User/admin passwords, MD5/MD5-sess, AES-256 encrypted config, TLS, SRTP, HTTPS, 802.1x, whitelist/blacklist
• Languages: English, German, French, Spanish, Portuguese, Russian, Chinese
• Upgrade/provisioning: Firmware via TFTP/HTTP/HTTPS or local upload; mass provisioning with encrypted XML
• Power: PoE 802.3af Class 3, PoE+ 802.3at Class 4
• Operating temperature: 0°C to 40°C
• Storage temperature: -10°C to 60°C
• Humidity: 10% to 90% non-condensing
• Dimensions: 215.32 mm diameter × 68.7 mm depth
• Weight: 0.8 kg
• Compliance: FCC Part 15 Class B, 15C, 15E, MPE; UL 60950 (adapter); CE; RoHS; RCM; IC

Features

• 3 beamforming directional mics with 4.2 m pickup: a teacher or patient speaks from where they are.
• Full-duplex two-way audio with acoustic echo cancellation: natural conversation without clipping.
• 8W HD speaker with 48 kHz sampling: clear speech in small and mid-size rooms.
• SIP paging and multicast on up to 10 addresses: intercom extension and paging speaker in one.
• PoE/PoE+, dual-band Wi-Fi and Bluetooth 4.0: one network cable covers power and data.