Increase the number of simultaneous calls supported by an eligible UCM RemoteConnect service with the Grandstream UCMRC EXTRA 20-CONCURRENT CALL ADD-ON. The add-on contributes 20 concurrent calls, allowing an organization to expand active-call capacity when its existing service level needs to accommodate more simultaneous voice sessions. Concurrent-call capacity concerns calls in progress at the same time rather than the number of users, extensions, or call records. This makes the add-on relevant when multiple inbound, outbound, or remote calls can overlap during operating hours. It is a software capacity add-on, not a communications endpoint, gateway, or appliance. This option is restricted to UCM RemoteConnect Plus, Pro, Business, and Enterprise service plans. Its distinguishing characteristic within the UCM RemoteConnect add-on range is the fixed 20-concurrent-call increment: select it when that increment matches the additional simultaneous-call requirement. Review the existing service plan and current concurrent-call requirement before assigning capacity so the added call allowance aligns with expected peak activity.