I have a customer that has OTIS Elevators using the REM (Remote Elevator Monitoring) system. (Not just an Analog Connection) The way that I have been told that it works is that when a user pushes the "Help" button, the Elevator then starts a Data Connection sending the various errors codes. It will then swap into a voice connection after the data has been pushed. This swap point is where I have the problem. The connection appears to just drop when they attempt to change modes. Apparently this works fine on a normal Analog connection, but the VG204 does not understand what it is trying to do.
Does anyone have any experience with this Elevator type, and what might need to be added to the port parameters to make this work? I talked to the manufacturer and all they could tell me was that it is proprietary and that it works all over the world, but they recommend a normal Analog Connection from the Telco Provider. As this is not to helpful, I am hoping someone might have experience with this Elevator type before I open a case.