How to Configure Grandstream GRP Series

Grandstream GXP21XX Series IP phones

Grandstream GRP2601(P), 2602(P/W), 2603(P), 2604(P), 2612(P/W), 2613, 2614, 2615, 2616 models

Important

  • Used phones previously connected to another PBX system need to be reset first. See how to do this here.
  • 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.
  • Known limitations
  • The first two keys are configured as line keys (via the template). This cannot be changed, otherwise the phone will not be able to make calls.
  • If BLF Transfer mode is set to “Attended Transfer” Shared Parking BLFs will not auto-complete the call and must be manually completed.
  • In order for the Phonebook to load properly, the First or Last name is required for each entry.

About the Grandstream GRP26 Models

  • GRP Professional IP Phones: Designed for enterprises, service providers and other high-volume markets. This series of next-generation IP phones features options including Bluetooth & Wi-Fi support, a dual LCD screen, support for up to 14 lines, 5-way conferencing and more. Compatible with Grandstream’s new cloud provisioning platform, GDMS (Grandstream Device Management System). Costs start in the region of $55.
  • GRP Essential IP Phones: The 4 devices in the Essentials series are easy to use and deploy making them ideal for on-site and remote workers. Costs in the region of $30.

Step 1: Identify your Exact Grandstream GRP26 Phone Model and MAC Address

Be sure you follow the steps for the correct phone model. You can find the model and the MAC address on the label at the back of the phone or by pressing and holding the “UP-navigation” key for 3 seconds. Take a note of the MAC address, you will need this for the configuration.

Step 2: Add The Phone to the User

Go to Admin Console > Users:

  1. Go to “Admin > 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 3: 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 user.

Step 4: 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 user 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 10 September 2026

https://www.3cx.com/sip-phones/grandstream-grp26-series/ 

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