Thanks for the advice guys.

It looks like I've got the materials I'll need to build a test lab. We still have our old system in storage, a strata dk424 and a bunch of 66 blocks, cables, and some phones. It's not as advanced as our newer system (can't plug it into our LAN), but at least I can experiment on it without worrying about taking down our whole phone system if I do something wrong.

Is there a way to simulate the outside lines this used to be connected to? I'd like to be able to simulate placing a call from within the system and receiving a call from outside the system. Is this in anyway possible? I'm a senior in an electrical engineering program, so I'm fine with designing and building circuits and programming microcontrollers to put out and interpret any kind of signal you can imagine, all I need are the specs of the required signals.

Thanks again guys,

Keith

If it works, cheer
If it doesn't work, find out why
If it catches on fire, BONUS!!!