1. Essentials Guide
  2. The Session Load Balancer and Route Manager
  3. Functional Overview

Functional Overview

Subscriber-aware Load Balancing and Route Management (SLRM) is a proprietary mechanism within the Oracle Communications Core Session Manager that presents a single target for devices sending SIP messages to your IMS core over the applicable interfaces. As such, SLRM provides load-balanced services connecting users to a group of Oracle Communications Core Session Managers as if they are a single node. Its load balancing functions are limited to operation with other Oracle Communications Core Session Managers as targets over Diameter. Oracle has developed and maintains a proprietary interface, the Sc interface, to manage load balancing operations with target Oracle Communications Core Session Managers. This interface is documented below.

The SLRM acts as an extension upon I-CSCF operation within the Oracle Communications Core Session Manager. It dynamically discovers and evaluates resource utilization of Oracle Communications Core Session Managers deployed in the core. Having discovered and identified each Oracle Communications Core Session Manager's status, the SLRM then distributes traffic between them. Applicable traffic includes:

  • SIP REGISTERs;
  • Out-of-the-blue SIP INVITEs from application servers; and
  • SIP INVITES from end-stations external to your network for which terminating services may apply.

The user must explicitly set their Oracle Communications Core Session Manager to operate as an SLRM using the command set-component-type. The user can confirm this operational mode using the show ims-core-product-type or the display-component-type command.