The RMS works if the gateway is set up as a modem, partial mode, or as OVER IP. But RMS does not work it the gateway is setup as a modem, full control. I find RMS nice to have if one wants to monitor the gateway or change the gateway setup remotely. But RMS is not bugfree - example: I've used RMS to remotely connect to the gateway and send text messages. It works 99% of the times, but sometimes a really ugly crash happens which freezes the TRB. Only rescue seems to be to turn power off, then on. Not so perfect if the modem is 500 miles away. For that and other reasons, we have decided to use TRB142 only in modem mode with full control, (essentially only AT-commands). Seems to be very robust and without surprises.