User's Manual Part 1

AT Commands 73
P/N 90023363 Revision 1.8
2 will set the modem to detect the dial tone, but not the busy signal. It will
also return the result code CONNECT<additional session-specific
text>.
3 will set the modem not to detect the dial tone, but detect the busy
signal. It will also return the result code CONNECT<additional
session-specific text>.
4 will set the modem to detect both the dial tone and the busy signal and
return the result code CONNECT<additional session-specific text>.
Response: This command will return the string OK.
Example: ATX4<cr>
ATZ
Description: RESET PARAMETERS TO SAVED SETTINGS
This command uses the user-defined modem settings profile stored in the
non-volatile memory as the active profile. If the user-defined profile is
invalid, the modem will use the factory default settings. Any additional
commands on the same command line are ignored. This command uses
the profile created by the AT&W command.
Syntax: ATZ[0]
Parameters: 0 This parameter is the default, as well as the only parameter, and
does not necessarily have to be typed with the command.
Response: This command will return the string OK.