It looks to me like modem AT commands going through your line, which means the SCO system is trying to reset the modem but the commands are going over the line instead. A couple of possibilities would be you are using a non-modem device name for your modem (ie. tty1a instead tty1A), or your modem on the Server end is configured for CD override instead of normal CD operations. It is remotely possible you just need to switch the modem off and back on at the server, but more than likely your modem configuration is not set up correctly for dialin, and that the problem is at the server end.