HP Compaq Presario,Presario 2105 Reference Manual page 111

Reference Information
Conexant AT Commands (Advanced Users Only)
Command
A
A/
Dn
E0
E1
H0
H1
I0
I1
I2
I3
I4
I5
I6
I7
I8
I9
L
n
M
n
N0 or N1
7–2
(Conexant)
Go off-hook and attempt to answer a call.
Re-execute command (not preceded by
Dial modifier: 0-9, A-D=DTMF digits; L=redial last number;
P=pulse dialing; T=tone dialing; W=wait for dial tone; * ("star");
# ("pound sign"); +; !=flash; @=wait for silence; $ or &=wait for
credit card dialing tone; ;=return to command state; '=dial
pause; ^=toggle calling tone. Parentheses, hyphens, and
spaces can be used to format dial string and have no other
effect.
Turn off command echo.
Turn on command echo (default).
Initiate hang-up sequence.
If on-hook, go off-hook and enter command mode.
Report product code.
Report LSB of stored checksum.
Report "OK."
Report identification codes.
Report product description.
Report country code parameter.
Report modem data pump model and internal code revision.
Report modem data pump model and internal code revision.
Report "OK."
Report country.
Set speaker volume: 0=off, 1=low (default), 2=medium, 3=high.
Activate speaker: 0=off, 1=on during handshaking and off when
receiving carrier (default), 2=always on, 3=off when dialing
and receiving carrier, on when answering.
Included for compatibility only; returns result code.
AT
).
Reference Guide