I have had tons of problems with the 502 unfortunately. A couple of weeks ago I re-flashed the .63 firmware and did a factory reset. Since then it has been working fine. I don't know if it was trying to connect to something that wasn't around anymore or what, but it seems to be much better. At one point it was taking all of my bandwidth just sitting there doing nothing, not even on a call.

I don't have anything entered in config server path. I just manually set all of the IP's and such and left the default factory dial plans. HOwever, I am connecting to an Asterisk box.