During the installation, the needed snap-ins are registered on the machine automatically. After the installation, the ixi-UMS Auto Attendant Configuration can be started via the start menu Programs - estos - ixi-UMS Auto Attendant.
However, the snap-ins - like any other snap-in - can also be added to a MMC.
Changing the Language of the Snap-In
It is explained at How To "Change MMC Language" how the language of the MMC can be changed after the installation.