GPRS module AT call control command

ATD

dial command. This command is used to set up a talk, data or fax call.

ATH

on-hook command.

ATA

answers the phone.

AT+CEER

extended error reporting. This command gives the reason for disconnecting the call when the last call setup failed.

AT+VTD

provides users with the application of GSM network to send DTMF (Dual Tone Multi Frequency) dual audio. This command is used to define the length of the double tone (default value is 300 ms).

AT+VTS

provides users with the application of GSM network to send DTMF dual tones. This command allows the transmission of dual audio.

ATDL

redials the last phone number.

AT%Dn

Auto-dial when Data Terminal Ready (DTR).

ATS0

automatically answers.

The call from AT+CICB

is poor.

AT+CSNS

single numbering scheme.

AT+VGR

AT+VGT

gain control. This command should be used to adjust the receive gain of the speaker and the transmit gain of the microphone.

AT+CMUT

microphone mute control.

AT+SPEAKER

speaker/microphone selection. This special command is used to select speaker and microphone.

AT+ECHO

echo cancel.

AT+SIDET

Sidetone correction.

AT+VIP

initializes sound parameters.

AT+DUI

dials with additional user information.

AT+HUI

hangs up with additional user information.

AT+RUI

receives additional user information.

3. Network service command
AT+CSQ

signal quality. +CSQ: 17,99

AT+COPS

service provider selection.
AT+COPS?

+COPS: 0,0,"China Mobile"

AT+CREG

network registration. Get the registration status of the phone.

AT+CREG?

+CREG: 0,1

AT+WOPN

reads operator name. NONE

AT+CPOL

priority operator list. NONE transferred from bbs.sendsms.cn