Have a look at this link: http://draytek.co.uk/products/vigor2820

Look under the 'Voice-Over-IP' Tab as it shows a photo of the adaptor you should have got with the unit.......

I am unsure as to where you can buy it seperatly.

Thanks Drewy,

I have emailed the guys at Draytek support but even if they offer to send me one, modifying the one I've got will probably be way quicker and I'm in a bit of a rush.

Thanks again.

Plug

x 1 2 3 4 5 6 x
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Socket 1

x 1 2 3 4 5 6 x
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pin 3 connects to plug pin 3
pin 4 connects to plug pin 4

Socket 2

x 1 2 3 4 5 6 x
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pin 3 connects to plug pin 2
pin 4 connects to plug pin 5

plug and sockets viewed from the front with contacts uppermost.
Hope the diagram is understandable

Drewy, you are a legend !!!

Took 5 minutes to modify the connector and is now working perfectly. My wife can now even use the home phone as an intercom to call me in the office. (Not sure that's a good thing or not yet)

The chaps at Draytek Support were great and they are going to send out an original RJ11 splitter but due to where we live, we probably won't receive it until after Christmas so your solution is perfect for me.

Thanks again and also to olejnik_uk for pointing me in the right direction.

Have a great Christmas.

Glad your all sorted...............

Have a good Christmas all..... ho ho ho

glad it did the trick.