In SX Microcontrollers, SX/B Compiler and SX-Key Tool, SteveW wrote:

>Im not sure how to get the line signal into 1's and 0's right now, as the line moves between +3v and -3v. I would have to have some analog circute to break it down into 4 wires with just 1's and 0's (0-5v) comming out of it. (any pointer here would be welcomed)

http://telecom.tbi.net/isdn-bu.htm  shows some of the detail, It's not entirely trivial - as you've noticed. 
You might get some useful receive hints from 
http://www.national.com/pf/TP/TP3410.html - the silicon's a bit expensive, and contains a transmit sectio you don't want. If you're not building a roduct, jsut a toy, I'd imagine you can ignore an awful lot of the cleverer stuff, but you'll sttill need the basic 2B1Q receivers, you should be able to do everything else in an  SX, though...

Steve

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