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A license is an authorization given to the end-user to use the application legally and specifies the terms of use. License enforcement is implemented on SBC to ensure that licensed functionality is restricted to the amount of sessions or licensed features purchased.

In local and network licensing modes, certain features that were previously treated as instance based (on/off) licenses, are now considered as count based licenses. A count based license can be dynamically floated and shared among the SBC in a network licensing mode. It also allows the enforcement of the number of sessions purchased in local and network licensing modes. All the licenses are now count based.

Sonus SBC is enhanced and provides three ways of licensing methods:

  1. Legacy Mode: The Licenses are attached to a particular SBC and this is an xml-based SBC license model.
  2. Local Mode: The licenses are fixed to the SBC and cannot be shared by other devices in the network. Licenses are installed on SBC through EMS or a new CLI interface by applying an xml-based license bundle. The xml-based license adopts the new license format, which includes additional data such as purchase order information.

  3. Network Mode: The licenses are assigned dynamically by a SLS server based on demand as traffic increases. When the traffic decreases, the licenses are returned to the server. These licenses can float between SBC based on the demand. Licenses are pooled centrally in the SLS server which is co-located with the EMS.

The system supports a countable license in the range of 0-x units:

  • In a local license mode, x is the license units purchased by the user and is part of the xml bundle that is applied directly at the SBC. When the local license mode is zero, it indicates that no license is purchased.
  • In a network license mode, x is limited by the number of units available at the Site License Server (SLS), the maximum count configured with the license in the required license table or any basic platform restriction. For example, Call Admission Control (CAC) or media profile configuration.

 License Encoded with Fingerprint Capability

  • The license is restricted and encoded with the fingerprint capability:
  • When the license is generated for a local license deployment, the license is encoded with the fingerprint of the SBC (or SBCs in the case of HA system) and the license is restricted to the SBC that matches the fingerprint.
  • When the license is generated for a network license deployment, the license is encoded with the fingerprint of the SLSs (Active and Standby) and the license is restricted to the SLS systems that matches the fingerprint.

License Floating

License floating enables a limited number of licenses to be shared among a number of network devices It is applicable when the SBC is deployed on network wide licensing with a centralized SLS distributing licenses to the SBCs connected to it.

License Floating Functionality

  • The SBC attempts to retrieve a single license from the SLS, when it is configured in the required license table with a minimum count of one (default).
  • When the minimum count associated with the license is one, the SBC returns licenses back to the SLS as demanded for the associated license drops. The SBC retains one license from the SLS when the SBC has 0 active call that require the license.
  • When the minimum count associated with the license is more than one, the SBC attempts to retrieve the configured number of licenses from the SLS.
  • When the minimum count associated with the license cannot be retrieved, but some license count is available, the SBC allows sessions that uses the license (limited by the amount retrieved) and periodically raises a trap to indicate that the SBC is operating below the configured minimum count.
  • When the minimum count is updated for the license on a system where the license is already in use, the SBC requests the delta between the minimum license count and the licenses already retrieved from the SLS. If the licenses already retrieved are greater than the configured minimum, then no extra licenses are requested.
  • When the minimum count associated with the license is more than one, the SBC retains the configured number of licenses locally even when no sessions require the licenses.
  • When the license is configured in the required license table, the maximum license count is set to unlimited by default. The SBC continues to request licenses from the SLS until the underlying platform constraints limit more sessions requiring the license (Example: congestion, configured CAC, media profile.) or the SLS license count associated with the license is reached.
  • When a maximum license count of x is configured for the license, the SBC does not retrieve more than x licenses from the SLS.
  • When the maximum license count is modified for the license. If the SBC is operating above the newly configured limit, the SBC does not retrieve any more licenses. The new sessions are allowed only after the number of licenses in use drops below the newly configured limit.
  • One or more SBCs provisioned with the license in the required license table requests and returns the licenses from the SLS in-line with demand for the license (call-rate that requires MRF transcoding). As the demand increases, the SBC allocates licenses. When the license request is outstanding, and more licenses are available at the SLS, the SBC allows new sessions requiring the license. As call rate drops, unused license counts must be returned to the central pool at the SLS.

License Deletion

There are two ways to delete a license:

  • From the xml bundle at CLI or EMA for a local license.

  • From the Required License Table, in case of network licensing.

The license deletions are allowed:

  • Local license bundle containing the license is deleted through EMA/CLI regardless of the current license mode.
  • The license name can be removed from the Required License Table regardless of the active mode of licensing configured at the system.
  • When license is removed from the required license table, it triggers an appropriate warning to the user along with a prompt, to ask if they wish to continue.
  • When the license is removed from the required license table, support for the licensed functionality is disabled system wide.
  • When the license is removed from the Required License table, all licenses retrieved to that point are released back to the Site License Server.

Any existing sessions that are initiated prior to the license being removed can continue, but new calls will be denied access to the associated licensed functionality.

License Expiry

  • In a local license mode - Once the license is expired, the SBC treats the licensed functionality as disabled system wide. Any existing sessions that are active on expiry continues unimpaired.
  • In a network license mode - Once the license is expired, the SLS does not serve any more licenses to the SBC.

Live Monitor for Licensing

The Live Monitor feature tracks and monitors the licenses that are used in the SBC. It is embedded in EMA to provide the usage/metrics, which improves the visibility.

  • Live Monitor does not display licensing metrics in legacy mode.
  • In local license mode, the license limit is fixed.
  • In network wide license mode, the available license limit changes dynamically as licenses are retrieved and returned to the site license server.

To access the Live Monitor option:

  1. Log on to EMA.
  2. Navigate to Monitoring > Dashboard > Live Monitor.

    If you are accessing Live Monitor option for the first time, you must click Enable.

    Figure : Enabling and Disabling Live Monitor Option

  3. Click Configure Live Monitor to customize and view the licensing metrics.

    Figure : Configure Live Monitor

    1. From the Available Metrics list, select the required items to be monitored. The selected items are added to the Selected Metrics.
    2. Select one of the Data Collection options:
      1. Collect data from all zones and trunk groups - Populates license usage from all zones and trunk groups.
      2. Collect data from selected zones and trunk groups below -  Populates license usage from selected zones and trunk groups.

    3.  Click OK. Selected metrics are displayed.

      Figure : Live Monitor

  4. Click Settings on the specific items for customization.

    If licenses are not installed, the License Usage/Licenses Installed list will be empty.

    Figure : Display Graph Settings

    1. Select the required option from the Display graph for drop-down list. The value ranges from past 1 hour to past 1 week.
    2. In Licensed Usage/ Licenses Installed drop-down list, choose the appropriate license type.

      RTU Licenses Installed are selected by default. If you want to see the metrics for MRF, select the MRF Usage per Call / MRF-RTU Licenses Installed option.

    3. Click OK.

To see the License Information, navigate to  All > System > License Info

Figure : License Information


To see the License Server Status, navigate to All > System > License Server Status

Figure : License Server Status


MRF Session License

In the Microservices SBC architecture, the S-SBC is enhanced to support an external Media Resource Function (MRF) using RFC4117 Session Initiation Protocol (SIP) interaction when transcoding is required. A new session license SBC-MRF-RTU is introduced to support external MRF transcoding and it is count based.

For every media session, an SBC-MRF-RTU session license plus a base SIP session license is required for external MRF transcoding. The MRF can be introduced to the call flow and subsequently removed when it is determined from the peers response that transcoding is not required. Therefore, the SBC-MRF-RTU license is checked for availability when sessions are sent towards the MRF and consumed (counted) only when the answer from the MRF indicates that transcoding is applied.

SBC-MRF-RTU license is supported when the SBC is set to local or network licensing mode.

SBC Session License for Remote PSX Access

SBC software license to restrict usage of the external PSX from the Sonus SBC.  When the SBC is configured for local or network wide licensing the customer must have purchased and applied the SBC-PSX-RTU license before call processing with an external PSX is allowed.


  • When the remote policy server is configured in an active, standby or alternate role, the SBC requires a valid SBC-PSX-RTU installed locally or available from the Site License Server (SLS).
  • The SBC requires 1xSBC-RTU (base session license) + 1xSBC-PSX-RTU license for each INVITE or SETUP initiated session at the SBC.


    • SBX-PSX-RTU and SBX-RTU, licenses must be available to allow a session when a remote policy server is configured at the SBC.
    • The SBC-PSX-RTU license is not applicable to the SBC 1000/2000 and GSX 9000 platforms.
    • The SBC-PSX-RTU license is not applicable to legacy license mode.
    • In a distributed SBC deployment, the SBC-PSX-RTU license is not applicable to Media SBC and Transcoding SBC.
    • For emergency calls, SBC-PSX-RTU allows additional 20 percent sessions as grace licenses when all licenses are exhausted.


For information related to Alarms/Traps, refer to Alarm Changes.

For CLI configuration, refer to Configuring License Using CLI.



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