I have a question, but first a little background info.:

I moved into my house about 9 years ago. There were about five phone sockets in various rooms, but I only used one, for a cordless phone base unit (plus handset) in the kitchen, with two other handsets in charging cradles in different parts of the house.

I was self employed at the time and wanted a dedicated line for work purposes so Telecom installed a second line with a single socket in a back bedroom that I set up as an office. About three years later I stopped contracting, and got a broadband connection. The office became a guest bedroom and the modem was plugged into one of the sockets for the main phone line, in a hallway near where our home desktop now lives. A DSL line filter was plugged into the kitchen socket where the phone base unit is.

About 18 months ago I upgraded to VDSL. A Chorus technician came out and installed a master filter/splitter where the phone line enters my house (the ETP?) and separated out the wiring to the socket where the modem is plugged in (at least I assume he did. I mean, that's why you have a splitter right? But he could have done anything or nothing and I wouldn't really know). I guess it would have been handy if I could have used the separate wiring for the old second line, but that just went to the back bedroom which is not where I want the modem.

Now for my question: 

I have seen some stuff about a different kind of plug that the VDSL modem/router is supposed to use. I don't have one - the VDSL modem is plugged into the same socket tha ADSL modem was plugged into, using a BT plug (I know it as a British Telecom plug - someone on here will probably tell me it has a correct RJ number or something). In fact, the Chorus tech got me to use the same cable that came with the old ADSL modem as the new VDSL modem didn't come with a cable with a BT plug. Nothing was done inside the house, either to the wiring or the phone socket where the modem is plugged in. 

So... is this a problem?

(edited to correct formatting - and some spelling)