If your system is set as key mode, you may want to exclude the shipping counter phones from the shared FXO lines. So that these phones can't make outbound calls through FXO lines. If your system is set to blend mode or PBX mode, we can't restrict outbound calls from one station. But you can restrict the stationat at the shipping counter to basic privilege so that only local calls are allowed.
Yes, you can configure a phone monitor button at the shipping station phone, this button monitors any phone which has the shared FXO line. When the incoming call to the shared FXO line, this montor button flashes and you can press it to answer the inbound calls.