To answer a Ring Indication
ATA
Echo
ATS60=0 (No echo)
ATS60=1(Local)
ATS60=2 (Remote)
Online Mode Echo
ATF
Enter Online Mode
ATO
et Data Forwarding Operation
AT\F
Manual Transmit Control
AT\M
Network Registration Control
AT\R
Set Subscriber Identity
AT\S
Automatic Transmit Control
AT\T
DCD mode
AT&C
Quiet Mode
ATM
Quiet Mode
ATQ