Toshiba V.90 - Manual (Page 41)

AT Commands
AT command formats
22
Result Codes:
P Select pulse dialing
This command configures the modem for pulse (non-touch-tone)
dialing. Dialed digits are pulsed until a T command or dial
modifier is received. Tone dial is the default setting.
Qn Result code control
Result codes are informational messages sent from the modem
and displayed on your monitor. Basic result codes are OK,
CONNECT, RING, NO CARRIER, and ERROR. The ATQ
command allows the user to turn result codes on or off.
Result Codes:
T Select tone dialing
This command instructs the modem to send DTMF tones while
dialing. Dialed digits are tone dialed until a P command or dial
modifier is received. This is the default setting.
O3 This command issues a rate renegotiation before returning to
online data mode.
OK n=0,1,3
ERROR Otherwise
Q0 Enables modem to send result codes to the computer
(default).
Q1 Disables modem from sending result codes to the computer.
OK n=0,1
ERROR Otherwise