The Reset entry specifies the command string that Unimodem sends to the modem to return it to a base configuration that is compatible with communications programs for MS-DOS and Windows operating systems.
One command string.
HKR,, Reset,, "AT&F<cr>"
This entry is generally "AT&F" or "ATZ". Some modems may use "AT&F1" or "AT&F2" for IBM PC-compatible configurations. It is important to ensure that the modem is in the state that the MS-DOS−based communications program requires (for example, verify echo is on).