Software applications such as Cisco Unified Communications Manager have the level of services knows as SWSS (Software Support Service) with the service type of ECMU or PSBU being the most popular choices. The SWSS service is sold based on the license that was purchased. So you are correct that it is per license. The license can range from the Essential license to the Enhanced Plus to the CUWL STD and PRO. So, you simply match your number and type of users and apply the proper SWSS services to each license.
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