rj11

When using an RJ11 for a telephone, and using the middle 2 pins for the line, which pin should be used for the bell wire? Is there a convention?

If anyone can help it would be REALLY appreciated.... Just had FTTP installed. The Fibre box has 4 ethernet RJ45 ports and one live RJ11 phone port which works fine with my home phone plugged into this port. I need to utilise my existing phone wiring around the house, so have joined into the...