Toshiba V.90 - Manual (Page 51)

AT Commands
AT command formats
32
Result Codes:
Qn Local flow control selection
Result Codes:
\Vn Protocol result code
Result Codes:
\N5 V.42. MNP or Buffer (same as \N3).
\N7 V.42. MNP or Buffer (same as \N3).
OK n = 0, 1, 2, 3,4,5,7
ERROR Otherwise
\Q0 Disable flow control.
\Q1 XON/XOFF software flow control.
\Q3 RTS/CTS to DTE (default).
OK n = 0, 1, 3
ERROR Otherwise
\V0 Disable protocol result code appended to DCE speed.
\V1 Enable protocol result code appended to DCE speed
(default).
OK n = 0, 1
ERROR Otherwise