The Grandstream GXW-4000 series, and Grandstream HT81X series ATA's use a different code structure than other Grandstream devices; they must be provisioned as 'Gateways' in NDP. This article explains how to provision these devices.

1. In the PBX Portal add a phone to a user and select "Manual or Softphone".

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The 'm' suffix is reserved for ReachUC.  Using the 'm' suffix for a non-ReachUC device may cause issues.

2. In your reseller Dashboard navigate to Manage NDP. Inside of NDP select configuration > Gateways.

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3. Click on Add configuration and populate the required fields.

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From here you can follow the instructions at https://skyswitch.elevio.help/en/articles/44 to provision your device.