GXP2135 Won't Provision

If your GXP2135 phone won't, or doesn't appear to provision, then there could be a few things causing this. The most common is caused by routers overriding the provisioning server address, via DHCP option 66. We won't go into the nitty-gritty of this feature, but the headlines are that it stops the auto-provisioning from working.

This is a feature that Grandstream enables by default on all their handsets, so if it is not required, we have to go into the phone's software and turn it off. This is what this guide is for. We will assume that the phone is already connected and has an IP address.


If the display shows a sign "No LAN Cable", it indicates the phone cannot detect a network cable in the device. This could mean there is a break in the cable or it's not plugged in correctly, either in the phone or in the switch/router.

If the phone displays "Network Down", it indicates that it can detect the cable, but that there is no network activity on the phone. This will normally mean the phone has not been allocated an IP address.

If neither of these are appearing, then please follow the steps below...

  1. On the phone, press the up key, as shown in the picture below...

  2. On the screen, you should see a small information display, which will list the IP settings, along with the phones MAC address and current software version. Make a note of the IPv4 address. If it says, it means the phone is not being provided with an IP address. Please check to ensure that the network is configured correctly to provide the device with an IP address.

  3. On a computer on the same local network as the phone, open a web browser, and in the address bar, type in the IP address from the phone. This should then load the login portal for the phone. It will look something like below...

  4. Log in using the username 'Admin' and the password 'admin'.

  5. Once in, browse to 'Maintenance' then ' Upgrade and Once there, look in the list of settings for the entry 'Allow DHCP Option 43 and Option 66 to Override Server' and set this to 'No'. You may also see other settings, as shown in the picture below. Ensure they are all set to No or None.

    Once the changes have been made, ensure you click the 'Save and Apply' button at the bottom of the screen.

  6. The final step is to reboot the phone to force it to attempt the provisioning again. You can do this by clicking on the 'Provision' option at the very top of the screen, as shown in the below picture...

    This should trigger the device to reboot, update any firmware (if required) and obtain the configuration we configured within the self-care portal. If the phone still doesn't appear to have provisioned after this, then please call us on 08003101010 for further assistance.

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