P Select Pulse Dialing; Qn Result Code Control; T Select Tone Dialing - Toshiba V.90 User Manual

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AT Commands
AT command formats
O3 This command issues a rate renegotiation before returning to
Result Codes:
OK
ERROR Otherwise

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.
Q0 Enables modem to send result codes to the computer
Q1 Disables modem from sending result codes to the computer.
Result Codes:
OK
ERROR Otherwise

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.
online data mode.
n=0,1,3
(default).
n=0,1