Strange dial tone on phone line

[#1]

The dial tone on our landline doesn't sound right - rather than the continous dial tone sound, ours has a pause in it (almost like it's beeping). Initially though this was because we had a voicemail, but this isn't the cause. We've been with Plusnet for a few weeks and I think our dial tone has always been like this - does anyone have any ideas as to what the cause of it could be? Not a  major issue, it's just starting to bug me! 

[#2]

Hi andydp,
This does sound a bit strange. Can you make outgoing calls and do you receive incoming calls successfully?
I can take a look into your account if you want to send me a private message with your username?

[#3]

Hi Andy,
Thanks for your private message! I've had a look on your account and also ran a line test and it's come back all fine.
Have you tried a different handset? If not then I'd recommend doing so and then let me know how that goes.

[#4]

Sorry if you've already tried this but have you tried dialling 1571 to see if there is actually a message waiting ?

[#5]

Lol I was just about to say that sounds like the 1571 message waiting signal

[#6]

Quote from: andydp

Initially though this was because we had a voicemail, but this isn't the cause.

That would have been the first thing I would have asked if it wasn't for the above quote.

[#7]

Dialling  *#001#  should indicate if any call features are active.

[#8]

Out of interest I tried that and got "The number you have dialled has not been recognised" on my PN phone line.
Is it possible that this code only applies to BT Retail services?

[#9]

I'm on BT for phone and got the same.

[#10]

Works for me on a PN line.

[#11]

If *#001# doesn't work, it's most likely you are connected to a System Y exchange...