3 Oracle Communications Unified Session Manager Basics

This chapter introduces key features and capabilities of the Oracle Communications Unified Session Manager. As an integrated IP Multimedia Sub-system (IMS) Call Session Control Function (CSCF), the Oracle Communications Unified Session Manager performs CSCF roles on a single platform. This configuration can simplify IMS deployment and operation scenarios. See product specification or Oracle consultative services to understand applicable deployments. This document does not provide general instruction on IMS; review the many generally-available IMS resources if you need introduction to its complex mechanisms.

The Oracle Communications Unified Session Manager operates within the context of an IMS or over-the-top (OTT) deployment. Within IMS, the device performs standard registration and call handling functions in compliance with 3GPP requirements. The presence of multiple CSCF functions on a single platform can simplify IMS operations. For those who prefer an OTT deployment, the Oracle Communications Unified Session Manager supports registration and call management via an ENUM or local subscriber database.

The Oracle Communications Unified Session Manager functions within IMS environments using Home Subscriber Server (HSS) deployments as subscriber database. Operation with IMS HSS resources is described in the Diameter Based Oracle USM chapter. For OTT, operation using ENUM resources is described in the ENUM Based Oracle Communications Unified Session Manager chapter and operation with local subscriber tables is described in the Local Subscriber Tables chapter.

By utilizing Oracle's Session Border Controller (SBC) product features, the Oracle Communications Unified Session Manager is also capable of performing a wide range of edge functions, separated along the following roles:

• Access functions
• Interconnect functions

This functionality and configuration is covered in the Oracle Communications Unified Session Manager Supporting the IMS Edge chapter.