Meaning of callstatusHandler.jsp return string

When I query for a call status using callstatusHandler.jsp sometimes I get as part of the returned string “Line Occupied. Try in 5 minutes”. Is this due to the gateway (modem) is busy or the call was attempted and a busy signal was received? Help me understand what is/has happened here. Also, is there a way to manage the retry time from 5 minutes to something else

“Line Occupied” means the modem cannot get a dial tone from the phone line. If you have a shared phone line, that could be someone else is using the phone line; or there is an incoming call (not necessarily connected) when the system tried to dial out.

Yes, you can change the retry time. It is set when you send the call request.