Telenetics 56 - Manual (Page 199)

AT Commands
Page 191
+VRA - Ringback Goes Away 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 +VRA=<interval>
Defined Values
<interval> Decimal number (0-255) specifying the silence interval time in
units of 0.10 second between the end of one ring interval and
the start of the next ring interval. A value of 0 forces the modem
to report the OK result code immediately after the first
Ringback. The range is 0.1 to 25.5 seconds for <interval> = 1 to
255.
Reporting Current or Selected Values
Command: +VRA?
Response: <interval>
Example:
50 (5 seconds) For the default setting.
Reporting Supported Range of Parameter Values
Command: +VRA=?
Response: (<interval>
range)
Example: (0-255) 255 = 25.5 sec
Result Codes
OK <interval> = 0-255
ERROR Otherwise, or if not in Voice Mode.
+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.