1. Go to your Velox dashboard Account and click User(s).
2. Click Edit on the extension where you want to attach the GXP2200Ext.
3. Click MPK and Extensions and Select Extension 1.
4. MPK 1, click then first Dropdown and select either Speed Dial or Transfer.
5. Click the second dropdown and select a group or an extension number to assign the action.
6. Repeat until the last MPK 40.
7. Reboot or power cycle your phone for the changes to take effect.
8. For further information please refer to Grandstream GXP220EXT User Guide.