Comtrol AT Command Set Rev A - Manual (Page 213)

AT Commands Reference Manual
100722B Conexant 6-15
+VRN - Ringback Never Appeared Timer
This command sets the length of time the modem will wait between ringbacks during call
origination before the modem can assume that the remote station has gone off-hook.
Syntax
+VRN=<interval>
Defined Values
<interval> Decimal number specifying the time period, in units of 1.0
second, that the modem will wait for Ringback during call
origination. A value of 0 forces the modem to report the OK
result code immediately after dialing. The range is 1 to 25
seconds for <interval> = 1 to 25.
Reporting Current or Selected Values
Command: +VRN?
Response: <interval>
Example: 10 (10 seconds) For the default setting.
Reporting Supported Range of Parameter Values
Command: +VRN=?
Response: (<interval> range)
Example: (0-25)
Result Codes
OK <interval> = 0-25
ERROR Otherwise, or if not in Voice Mode.