Cutting and extending virgin media phone cables - basic query

[Barzin]

Hi,
I have a query about virgin media telephone cables. I’ll say up front that this doesn’t directly affect the broadband cabling which is routed elsewhere.
The main cable comes in off the street and into the brown junction box. From here, a telephone cable tracks under the front door to the kitchen. From the kitchen a slave cable runs back out and also under the front door. Both cables are snuggly fits and have no “give”.

We’re getting a new front door and the cable will need to drop lower and will need extending to accommodate this. The only way I can see to do this is either replace the whole cable, or to cut and add an extension piece. I’d prefer the latter because it’s easier, and I can hide the junction boxes.

So now for the question - can I just cut the cables and fit in an extension piece using gel connectors and a couple of junction boxes, or will I cause problems? Second, if I do this, how many internal cores will I need to deal with in each cable?

These are hopefully quite simple questions, but as I’m a newbie to telephone cables I’m relatively clueless!

Thanks in advance!

 

[sparkymarka]

Only two cores needed ...

 

[Sally2000]

There are four wires, only two will be in use. You can check which two by looking inside the last terminal box. But probably best to connect up all four.
Don't try the same with the broadband cable.
(VM user here)