Toshiba Portege 3500 User Manual page 206

AT Commands
H-16
\Q0 Disable flow control.
\Q1 XON/XOFF software flow control.
\Q2 CTS/RTS to DTE (default).
Result Codes:
n = 0, 1, 3
OK
Otherwise
ERROR
\V1 Disable protocol result code appended to DCE
speed.
\V2 Enable protocol result code appended to DCE
speed (default).
Result Codes:
n = 0, 1
OK
Otherwise
ERROR
If blacklisting is in effect, this command displays the numbers
for which the last call attempted in the past two hours failed.
The ERROR result code appears in regions that do not require
blacklisting.
Portégé 3500