xcmHrConsoleSoundVolume 1.3.6.1.4.1.253.8.53.21.2.1.11

The console sound volume control. This is often used to control how loud the fax modem telephone line sound is. This is often a number 0 through 10 where 0 is console sounds are off, 1 is the lowest volume and 10 is the highest volume.