FD 40 for Asterisk 11.16

Good day!
Please tell me what module res_failover.so to use for asterisk-11.16.0?

Hello,

Please refer to this manual to get the res_failover.so module .
www.openvox.cn/pub/manuals/Release/Engli...D140_User_Manual.pdf

Good afternoon, thanks for the reply! On your instructions I have installed the module failover. But there are some interesting things: when I start asterisk with the command:
/etc/init.d/asterisk start

in the console there is a error:
CLI> failover show
* DEVICE#1: openvox_failover_1 /dev/ttyUSB0
INTERVAL:4000 EVENT:logger AUTORUN:yes STATE:ERROR
If you run the command:
asterisk &

all right. Please tell me why the difference?
CLI>failover show
* DEVICE#1: openvox_failover_1 /dev/ttyUSB0 VERSION:1.0
INTERVAL:4000 EVENT:logger AUTORUN:yes STATE:RUNNING