This is a system that was installed in 1986, and I don't believe that it has ever had a software/firmware update. I'm trying to get in to find the software versions, see how many exts they have, and change some dialing restrictions. I call them, ask them to transfer *10 transfer - I get dead air, then they come back on the line. I get no modem tones for a connection. Do the older systems not have remote admin capability or is something broken?