Enabling HA requires the purchase of an HA license. Additionally, you must choose a licensing scheme for the deployment. You must select Node-lock Licensing (NLL) or Network-wide Domain Licensing (NWDL), per the descriptions below.  

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HA SKU

You must purchase an HA SKU to deploy HA on your system. Once you place an order through the Ribbon Partner Portal for HA functionality, Ribbon sends you an email that contains information on where to obtain the license associated with your system. You will receive one license for the HA pair.
If you need help with your HA license, contact your Ribbon sales representative or Ribbon Global Support at 1-833-724-2661.

Node-Locked Licensing (optional) 

The NLL method is where an installed license file locks sessions and features to a specific SBC Edge node, identified through its hardware serial number or Virtual Machine Universal Unique Identifier (UUID). For more information, refer to Node-Locked Licensing and License Management.

Network-Wide Domain Licensing (optional) 

The NWDL method associates licenses with a domain or a network instead of individual devices. RAMP must manage NWDL licenses;