Hi Oyster,
Thank you for your post.
I'm sorry to hear you've been having issues with your landline phone after switching over to the VoIP service.
In regards to the settings, they look correct - you are only allowed one Hub per property, and switching over to VoIP doesn't change that - it just means that you'll be able to use the landline service via the hub.
After having a look at this end, I can see that you are actually currently affected by an SNR outage in your area - this will cause an intermittent broadband and landline connection until resolved.
The estimated fix date is for tomorrow, so please do let us know then if you are still experiencing issues and we'll be happy to take a closer look
We're sorry for the inconvenience caused in the meantime
Beth