1. Essentials Guide
  2. The Session Load Balancer and Route Manager
  3. The Sc Interface
  4. Sc Interface Messages
  5. Service Association Messages

Service Association Messages

The service association message sequence, SVR/SVA, is proprietary Diameter messaging that the Oracle Communications Core Session Manager uses to advertise itself to an SLRM, specify its status in terms of service and capacity information, and remove its association with that SLRM. The process can be understood as a registration process. The Oracle Communications Core Session Manager uses this messaging for the following purposes:

  • INITIAL — On boot up, the Oracle Communications Core Session Manager sends the request to advertise itself to the SLRM. This includes Oracle Communications Core Session Manager's registration information. This information is updated every 20 seconds.
  • REFRESH — The Oracle Communications Core Session Manager uses this message to refresh/update its association (registration) with the SLRM. If the Capacity/Service info is not refreshed and it expires, the SLRM considers the Capacity/Service info to be invalid, so it changes the Oracle Communications Core Session Manager status to "Out of Sync". Changes to the following trigger a refresh with updated info immediately:
    • A change in service information, such as service-cluster-Id.
    • The Oracle Communications Core Session Manager cannot handle anymore endpoints.
    • The Oracle Communications Core Session Manager can handle endpoints again.
  • TERM — The Oracle Communications Core Session Manager uses this message to terminate its association (de-register) with the SLRM. On receiving this message, the SLRM removes the peer Oracle Communications Core Session Manager and clear all state information.

The Oracle Communications Core Session Manager specifies the service association request type in the SVR's Request Type AVP.