How to Configure Grandstream GSC35 Series Speaker / Paging Devices

Grandstream GSC35xx Series for 3CX

Grandstream GSC3505 and GSC3510 models

Important

  • Used phones previously connected to another PBX system need to be reset first. See how to do this below.
  • These devices are supported directly by the vendor. If you need to upgrade the firmware, obtain the appropriate firmware version directly from the device vendor. Then navigate to Phones > Options > Enable Untested / Unsupported Firmwares, and go to Phones > Firmwares to upload and deploy the firmware as required.

About the Grandstream GSC35 Paging Devices

The GSC3500 Series provides intercom and paging capabilities for interior areas such as office buildings, businesses, schools, hospitals, shopping malls, residential settings, warehouses, and other similar establishments. With the help of this series, companies may create robust SIP paging and intercom systems that increase security and communication.

GSC3510: The GSC3510 is a perfect intercom speaker/microphone for any location thanks to its cutting-edge industrial design and capabilities. This SIP intercom device features 3-directional microphones with Multichannel Microphone Array Design (MMAD) that provide a 4.2 meter pickup distance, a high-fidelity 8W HD speaker, and 2-way voice functionality. Costs start in the region of $279.

GSC3505: The GSC3505 is the ideal SIP speaker for any setting thanks to its cutting-edge industrial appearance and plenty of functions. It features an 8-Watt HD speaker with HD audio, supports Bluetooth devices, integrated dual-band Wi-Fi, SIP and multicast paging, as well as built-in whitelists and blacklists that make it simple to reject nuisance calls. Users can create cutting-edge security and PA announcement systems by combining the GSC3505 with other Grandstream products. Costs in the region of $239.

Step 1: Identify your Exact Grandstream GSC Intercom /Paging Device and MAC Address

Be sure you follow the steps for the right phone model. You can find the model and the MAC address on the label at the back of the phone. Take a note of the MAC address, you will need this for the configuration.

Step 2: Factory Reset the SIP Speaker’s Public Address

Grandstream GSC35XX - Reset

  1. Press and hold the “Reset” button for 15 seconds and then release.
  2. The center LED will start blinking red.
  3. The device will restart and reset to factory settings.

Step 3: Add The Phone to the Extension

From the admin console in your web client:

  1. Go to “Users” and select the user you want to add a phone for.
  2. Click on the “IP Phone” tab. Click “Configure a phone” to add a phone.
  3. Now select your phone model from the dropdown menu.
  4. Enter the phone’s MAC address without dashes or colons, and click “Add phone”.

Step 4: Router Phone, SBC or LAN?

  1. If 3CX is on the cloud, you must use a router phone or SBC:
  1. If it is not a router phone you need to specify one or an SBC.
  2. If the device is a router phone, you can connect it directly as a router itself.
  1. If 3CX is on premise or self hosted, you have an additional option, you can select “Local LAN/VPN”.
  2. Click “Add Phone” to save the phone configuration for this extension.

Step 5: Connect the Phone

3CX will now create provisioning information for the phone and make these available on the provisioning URL. The phone must connect to this URL to retrieve its configuration information and authentication details. You have the following options:

  1. RPS - Connect the phone to the network within 14 days. If it is already connected, restart it. The phone will be configured automatically and restarted.
  2. PNP - If 3CX is on premise or connected via SBC, you can connect the phone to the LAN and look for it in the PNP dialog (Admin Console > Phones > PNP Phones). Right click and assign it to the extension you configured above.

  1. Alternatively you can login to the phone's webUI and enter the URL manually. You can also use DHCP option 66.

See also

Last Updated

This document was last updated on 19 February 2026

https://www.3cx.com/sip-phones/grandstream-speaker-intercom/

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