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M2 Internal speaker always on
M3 Internal speaker on until carrier detected and
off while dialing
N_ N0 Connect only at DTE rate
N1 Automatic rate negotiation
O_ O0 Return to Data Mode
O1 Return to Data Mode and initiate an equalizer
retrain
P Set Pulse dial as default
Q_ Q0 Modem sends responses
Q1 Modem does not send responses
Sr? r=0-30 Read and display value in register r
Sr=n Set register r to value n (r=0-30; n=0-255)
T Set Tone Dial as default
V_ V0 Numeric responses
V1 Word responses
X_ X0 Hayes Smartmodem 300 compatible
responses/blind dialing
X1 Same as X0 plus all CONNECT responses/
blind dialing
X2 Same as X1 plus dial tone detection
X3 Same as X1 plus busy signal detection/blind
dialing
X4 All responses and dial tone and busy signal
detection
Y_ Y0 Modem does not send or respond to break
signals
Y1 Modem sends break signal for four seconds
before disconnecting
Z_ Z0 Reset and retrieve active configuration
profile 0
Z1 Reset and retrieve active configuration
profile 1
3.4 Extended AT Commands
&C_ &C0 Force Carrier Detect Signal High (ON)
&C1 Turn on Carrier Detect signal when remote
carrier signal is present
&D_ &D0 Modem ignores the Data Terminal Ready
signal