Changing digital phone line to analog

[Brokengod]

I have a digital phone line that's connected to a pbx which I need to change to analog. Does anybody have any links to websites which show the wiring changes?

[The Shiznit]

I believe that you need an analogue card in the pbx and its not as easy as a wiring change. Could be wrong, but we have 8 pbx's here.