Thanks for your post on our Community Forums @Morphthedog, and a very warm welcome to you!
Sorry to hear of the issues with the landline phone.
Can you please advise me if there's a dial tone on the phone at all?
Does the handset connect to the phone line, or is this provided to her via the router?
Has an alternative handset been used to rule out the prospect of a faulty handset?
Kindest regards,
David_Bn