Asterisk func volume

Syntax:

VOLUME(TX|RX)

In 1.8:

VOLUME(TX|RX[,options])

Synopsis:

Set the TX or RX volume of a channel (New in 1.6)

Arguments:

 direction — Must be ‘TX’ or ‘RX’.

 options — p: Enable DTMF volume control


Description:
The VOLUME function can be used to increase or decrease the tx or rx gain of any channel.
Example:
Set(VOLUME(TX)=3)
Set(VOLUME(RX)=2)
Set(VOLUME(TX,p)=3)