Set(VOLUME(TX)=3) Asterisk11

Asterisk Asterisk Support
1

Friends, I would like to know if anyone has used the functions of Asterisk volume 11, and it actually increases the volume and set as:

Set(VOLUME(TX)=3)
Set(VOLUME(RX)=2)

https://wiki.asterisk.org/wiki/display/AST/Asterisk+11+Function_VOLUME

Thanks