AT+VLS?
DCE will return current I/O device followed by the OK result code.
AT+VLS=?
DCE will return permitted I/O devices. The response is:
0,2,8,16
OK
with <CR><LF> between each line.
AT+VRA=<value>
This command sets the amount of time the DCE shall wait between ringbacks before the
DCE can assume that the remote station has gone off hook. The default value is 70 (7 seconds).
The range of the <value> is from 0 to 255. The units are 0.1 second. A value of zero forces
the DCE to return VCON immediately after the ATD command is received.
Result codes:
OK:
The DCE issues this result code if DCE accepts this command.
ERROR:
The DCE issues this result code if <value> is out of range.
AT+VRA?
DCE will return current Ringback Goes Away Timer, followed by the OK
result code.
AT+VRA=?
DCE will return permitted interval of Ringback Goes Away Timer.
The response is:
0-255
OK
with <CR><LF> between each line.
AT+VRN=<value>
This command sets the amount of time the DCE will wait looking for ringback. If the DCE
does not detect a ringback in this time period, the DCE shall assume that the remote station has
gone off hook.
The range of the <value> is from 0 to 255. The units are 0.1 second. A value of zero forces
the DCE to return VCON immediately after the ATD command is received.
Result codes:
