Grandstream GSC3505 One-Way SIP Paging Speaker with 8W HD Audio

The Grandstream GSC3505 is a one-way SIP paging speaker with an 8W HD driver, powered over a single Ethernet cable through PoE. It suits schools, corridors, offices and residential buildings that want announcements handled by the phone system.

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The Grandstream GSC3505 is a one-way SIP speaker for public address and announcements over the data network you already have. It pairs an 8W HD driver with PoE power, so one Ethernet cable carries both audio and electricity. It fits schools, corridors, clinics and offices that want paging run from the phone system instead of a separate 100V amplifier and speaker cabling.

Grandstream GSC3505 specs at a glance

There is no microphone: the GSC3505 plays audio, it does not pick it up. Key figures from the official datasheet:

• 8W high-fidelity HD speaker with full-band audio.
• One 10/100 Mbps Ethernet port, PoE 802.3af Class 3 or PoE+ 802.3at Class 4.
• Dual-band 2.4/5 GHz Wi-Fi (802.11a/b/g/n) and Bluetooth 4.0 with EDR.
• 215.32 mm diameter, 68.7 mm deep, 0.8 kg.

SIP paging and prioritized multicast

Register the speaker as an extension and anyone can dial it for a live announcement. For building-wide messages, multicast paging lets each unit listen on up to 10 addresses, each with a priority from 1 to 10, so an emergency page cuts through routine announcements or background music. The user manual notes that the sender and the speakers must sit on the same LAN.

Built-in whitelists and blacklists keep unwanted callers off the speaker.

Audio quality on a busy network

G.722 and Opus give wideband voice, while G.711 and G.729A/B keep it compatible with most PBXs and SIP trunks. Layer 2 and Layer 3 QoS tagging puts voice packets first, so announcements stay clean on a crowded school or office network.

Power and mounting kits

The GSC3505 is powered over 802.3af PoE or 802.3at PoE+, so connect it to a PoE switch port or an injector. The box holds the mounting kits and screws but no power adapter.

Where it fits in Saudi buildings

• Schools: office announcements in every classroom and hallway.
• Warehouses: paging staff in site offices and break rooms.
• Clinics and hospitals: calling patients in waiting areas.
• Residential towers and compounds: notices in lobbies and corridors.

Compatibility

The GSC3505 speaks standard SIP (RFC3261), so it registers on SIP PBXs such as the Grandstream UCM series. Grandstream also pairs it with its desk and cordless IP phones and its GDS door systems, for example to trigger an announcement from a door station or an alarm. Mass provisioning through AES-encrypted XML files saves hours on projects with dozens of speakers.

GSC3505, GSC3510 or GSC3506 V2?

The GSC3510 shares the same housing and 8W speaker but adds three directional microphones with 4.2 m pickup, turning it into a two-way intercom. The GSC3506 V2 is also a one-way PA unit, but with a 30W coaxial speaker, line-out, USB, PoE++ or 24V DC power, and no Wi-Fi or Bluetooth. Pick the GSC3505 for classrooms and offices, and step up to the GSC3506 V2 for halls and large warehouses.

Frequently Asked Questions

Does the GSC3505 have a microphone?

No. It is a one-way announcement speaker. For talk-back from the same unit, choose the GSC3510, which adds three mics with 4.2 m pickup in the same housing.

Does it need a power adapter?

No adapter is included. It runs on PoE or PoE+ from a PoE switch or injector over the network cable.

Will it work with a Grandstream UCM PBX?

Yes. It registers as a SIP extension on UCM and other SIP PBXs, and supports multicast paging to many speakers at once.

Specifications

• Model: GSC3505
• Series: GSC3500 Speakers
• Type: One-way public address SIP speaker
• 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 integrated PoE/PoE+
• Wi-Fi: Dual-band 2.4/5 GHz, 802.11a/b/g/n, WMM
• Bluetooth: Integrated, Bluetooth 4.0 + EDR
• Voice codecs: G.711µ/a, G.722, G.726-32, iLBC, Opus, G.729A/B; in-band and out-of-band DTMF
• Telephony features: SIP paging, multicast paging, call waiting with priority override
• Multicast paging: Up to 10 listening addresses, priority 1 to 10 (sender and speaker on the same LAN)
• HD audio: Yes, full-band audio via HD speaker
• Speaker: 8W high-fidelity HD speaker
• Microphone: None
• QoS: Layer 2 (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)
• Security: User/admin passwords, MD5/MD5-sess authentication, 256-bit AES encrypted config file, TLS, SRTP, HTTPS, 802.1x
• Languages: English, German, French, Spanish, Portuguese, Russian, Chinese
• Upgrade/provisioning: Firmware via TFTP/HTTP/HTTPS or local upload; mass provisioning with AES-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: Unit 0.8 kg
• Compliance: FCC Part 15 Class B, 15C, 15E, MPE; CE; RoHS; RCM; IC
• In the box: GSC3505 speaker, mounting kits (metal and plastic brackets, screws, anchors, hex screwdriver), quick installation guide, GPL license (no power adapter)

Features

• 8W HD speaker with full-band audio: clear announcements in a classroom, hallway or meeting room.
• Multicast paging on up to 10 addresses with priorities 1 to 10: emergency pages override routine ones.
• SIP extension registration: any IP phone on the PBX can call it.
• PoE 802.3af or PoE+ 802.3at on a 10/100 Mbps port: one cable for audio and power.