We built the house in 2009 and it was wired for land line in two-wire configuration.

We went with naked DSL and VOIP phone. The house was reconfigured to move the start point into the office - the electrician pulled an extra wire from the house entry point into the office and all the BT wall sockets (except the first) were replaced with data jacks. In the office we have a double phone jack. The "inwards" is a BT jack for naked DSL and the modem was plugged into that. The phone then came from the modem into the other jack (handset plug into the data socket) for distribution to the rest of the house in a daisy chain. Handset plugs were used in the data jacks for each phone.

The VOIP phone has become unusable due to congestion on the broadband, so we are reverting to land line. I have put the BT jack points back in the walls. Each of the wall sockets has two wires connected, I suppose in and out. In the office, there is one wire coming to the "in" jack and two leaving the "out" jack. It all works if I use a BT extension cable - BT plug on each end - to bridge between the "in" jack and the "out" jack in the office.

I want to replace the cable hanging from the wall with a bridge in the wall. I have tried white to white and blue to blue between the two plugs but it doesn't work.

What should I do?

Thank you for any help you can give.