Unfortunately as far as I know its not compatible with UFO lines , I would suggest contacting the UFO team on the number you have been given to verify that information.
The UFO help page shows that call safe is actually compatible, but only the UFO team can activate it for you.
Try the Live chat option at the bottom of the page.
Sorry for any confusion.
Thanks, will you let me know what you find please. When I have contacted TalkTalk, I am told that CallSafe is switched on, or that they will switch it on. It is only when speaking to the dedicated UFO team, that I get to know that CallSafe is not compatible and almost certainly I will never get CallSafe or an equivalent.