If you are logging in by the admin phone. I think you can hit the up and down volume key to go to the next port. Get an extension list that the school uses. See what numbers are missing and let somebody stand outside and dial the number and make a call to each port(after school is out). Or try and put in numbers that are missing in you list and see if that port is assigned to them. Better yet if you know what port. Progam a new port and move the wire to that new port. Then you will know what the arch number is for that speaker. But I do think you can put in port number and get the arch number. I will have to check.