Ok, I'm using a commercial distro of Asterisk called Evolution for Intuitive Voice.
http://www.intuitivevoice.com/

Management is uncomfortable with the idea of IT being in charge of phones also.... So we have paid supprot with them.

My question is I don't understand the fields in the Asterisk Zimlet.

1. I have no idea what my pbx username is I'm guessing its my phone extension?
2. Password? No Idea
3. My Conference Bridge - don't even know what that is.
4. My mobile number 757-xxx-xxxx
5. My Desk Number - I hope that is the same as my phone extension

I gather from the other posts that I need to manually edit the asterisk server config in the xml file and repackage and deploy.