Does Anyone have info regarding: Command byte sequence used by Digital Voice Simultaneous Data Modems (DVSD) to signal data routing changes between CoDec-Digitized Voice stream and file data stream incoming from PC. I suspect there is a byte sequence to signal a routing change and then file type byte inserted into the data stream to signal the receiving modem where to route its incoming data between voice and data destination devices/ports. There are apparently 3 major formats being used by US Robotics, Rockwell, and Hayes. TIA, -John sirejohn@bbs-la.com