AudioCodes Mediant 4000 SBC User Manual page 646

When installation completes, the following message box appears:
Figure 38-9: Reset and Save-to-Flash Success Message
5. Clock Close to close the message box; you are logged out of the Web interface and
prompted to log in again. The features and capabilities displayed on the License Key
page now reflect the newly installed License Key.
38.2.1.2.2 Installing on HA Devices
When the device operates in HA mode, the installation of a License Key can be done only
from a License Key file. You can install the License Key using one of the following
methods:

Hitless Upgrade: The License Key is installed on both devices without affecting
traffic, by employing the following mechanism:
1. The License Key file is loaded to the active device.
2. The active device sends the file to the redundant device.
3. The redundant device installs the file, by saving it to flash memory with a reset.
4. The active device saves the file to flash memory (without a reset).
5. The devices undergo an HA switchover, whereby the active device becomes
redundant and the redundant device becomes active. Current calls are
maintained and handled by the active device (previously the redundant device).
6. The redundant device (previously the active device) resets to install the file.

Non-hitless Upgrade: The License Key is installed on both devices simultaneously
(both reset at the same time). Therefore, this method is traffic-affecting and current
calls are terminated. The installation process is as follows:
1. The License Key file is loaded to the active device.
2. The active device sends the file to the redundant device.
3. Both devices install the file, by saving it to flash memory with a reset.
Note:
•
The License Key file for HA contains two License Keys - one for the active device
and one for the redundant device. Each License Key has a different serial number
("S/N"), which reflects the serial number of each device in the HA system.
•
Currently, hitless software downgrade from Version 7.2.150 to an earlier version is
not supported (and the non-hitless method must be used).

To install a License Key file for HA through Web interface:
1. Open the License Key page (see Viewing the License Key on page 641).
2. Back up the currently installed License Key, as a precaution. If the new License Key
does not comply with your requirements, you can re-load this backed-up License Key
to restore the device's original capabilities. For backing up the License Key, see
Backing up the License Key on page 651.
3. Click the Load By File button, navigate to the License Key file on your computer, and
User's Manual 646
Mediant 4000 SBC
Document #: LTRT-40203