COMMAND
DESCRIPTION
ATA/
Repeat the previous command.
ATA
Answer.
ATB0
CCITT operation at 300 or 1200 bps.
ATB1
Bell operation at 300 or 1200 bps (default).
ATD
Dial.
ATD0-9
Dial the DTMF digits 0 to 9.
ATDA-D
Dial the DTMF digits A, B, C and D.
ATDP
Select pulse dialing; effects current and subsequent dialing.
ATDT
Select tone dialing; effects current and subsequent dialing.
ATD!
Flash: go on-hook by time defined by S29.
ATDW
Wait for dial tone detection before dialing a number. If no dial tone is detected within the time specified by S7, the modem aborts the rest of
the sequence, goes on-hook and generates an error message.
ATD@
Wait for five seconds of silence before proceeding with next dialing string and then complete handshake sequence.
ATD,
Pause. The modem pauses for a time specified by S8 before dialing the number. Most often used when dialing an outside line through a PBX.
ATD;
Return to the command mode after processing the command.
ATE0
Disables the command echo.
ATE1
Enables the command echo (default).
ATH0
Hang up.
ATH1
Forces the modem off-hook.
ATI0
Reports product code.
ATI2
Reports OK (for software compatibility).
ATI3
Reports the firmware version of the modem. Example: CX810801-V90.
ATL0
Sets the speaker volume off.
ATL1
Sets the speaker volume low (default).
ATL2
Sets the speaker volume medium.
ATL3
Sets the speaker volume high.
ATM0
Speaker is always off.
ATM1
Speaker is on during call establishment but goes off when carrier is detected (default).
ATM2
Speaker is always on.
ATM3
Speaker if off during dialing and when receiving carrier but on during answering.
ATQ0
Enables result codes to the DTE (default).
ATQ1
Disables result codes to the DTE.
ATSr
Establishes S-register “r” as the default register.
ATSr=n
Sets S-register “r” to the value “n.”
ATSr?
Reports the value of S-register “r.”
ATV0
Enables short-form result codes.
ATV1
Enables long-form result codes.
Table H.2 Basic AT Commands
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