DIal tone cutting in and out

[#1]

I'm trying to establish whether this is normal. It sounds kind of like the 1571 voicemail dialtone notification, but dialing 1571 tells me I do not have this service.

[#2]

Looks like there's a fault with the 1571 then as it's showing as active on our side of things. I think we can get a fault raised on that, I'll see if we can and report back either way.
EDIT: Fault raised and ticket placed on your account with the details, hope it's sorted quickly for you.