If your GXP16xx 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.



  1. On the phone, press the below button. It should be labeled on the screen as "NextScr".


    You should see the IP address of the phone shown on the screen. Make a note of it. If it displays 0.0.0.0, it means the phone has no network connection. Please check the network connection to the device.

  2. Open a web browser on a PC/Mac on the same local network as the phone, and type the IP address in the address bar. This should then take you directly to the phone's login screen, like below...


    The username is admin and the password is admin.

  3. Once logged in, go to 'Maintenance' then 'Upgrade and Provisioning'. 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.

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


Once the phone has rebooted, it should then contact us and download its new firmware and/or provisioning information. If the phone still doesn't appear to have provisioned after this, then please call us on 08003101010 for further assistance.