Using the Konftel 300Wx with Konftel IP DECT 10 outgoing calls work fine, but not incoming calls.
This is most likely due to the fact that no handset (Konftel 300Wx) is assigned to the extension configured in the IP DECT 10.
To solve this issue please follow the steps below.
Log in to the web interface of IP DECT 10. Go to extensions
Click on the extension you want to assign the Konftel 300Wx.
Select the preferred Konftel 300Wx in the "Select Handset(s)" table.
Click on save to apply the changes.
Now you should be able to make incoming calls to the Konftel 300Wx.