Phone making noise when not in use

Question

Hi. I currently have one phone downstairs, and two upstairs. However, during different intervals throughout the day, the two phones upstairs will make a noise, even though no-one is using any of the phones. It is one beep, then followed by another beep about 5 seconds later. It is the same 'beep' that can be heard when someone IS using the phone downstairs, and then hangup the phone. What could be the cause of this noise?
To make matters worse, whenever this noise occurs, it will invariably disconnect my broadband connection. How can two phones make a noise, when no-one is using any of the phones in the house? Thanks for any answers.

Answer 1

- if you havve extension sockets then they should be wired to terminals 2 & 5 of the detachable bottom half - your last picture.  I think from your first picture that someone has wired the extension to tyhe same terminals A & B on the backplate of the master socket your first picture.  the incoming BT wires are normally blue/white and white/blue
I have a socket upstairs, but that is connected like the following. It is actually the wire at the very bottom of the splitter, and not one of the ones that has a filter. One filter goes to the main phone, the other filter for the Sky. Is this classed as an extension socket?
This is what it looks like upstairs (Ive added a filter, but its pretty much the same):
- I can see whay DS and Imjolly are getting at with reference to the extension being wired to the back of the NTE itself but it may be the case that the engineer who has installed it has just used an internal 4 wire (which they also use for extensions) from the block terminal, that's the little white box in the second picture down to the NTE5a. If that is the case there is really nowt wrong with that at all.
Do DS or Imjolly agree or disagree with this? When I put the master socket front back on, I get a reception on the phone, so it must work fine, even without any wires connected, right?
-You really shouldn't and I can't suggest this, but may be have the rear of the main part looked at, by BT of course, and possibly provide an image of this too. there should only be 2 wires (1 pair) connected to terminals A&B on the rear of this main part.
Looking at the picture of the master socket from earlier, to do this, would I only have to unscrew the screw that is most central (and not the left and right ones)?
Firstly have you checked the batteries in your smoke alarm?
Yup. Its definately the phones.
Do the phones upstairs plug into telephone sockets or are they just slave handsets that connect to the main base station?
I think the pictures in this post answer that. The blue and white wire coming out of the splitter are two phones.