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Call Control Software Interfaces

Introduction

The Call Control components communicate through a set of structured interfaces with one another, other call processing components, and the host. The software interfaces shown below provide high level management of network signaling events and call processing events.

Figure 5-3 Software Module Interfaces

Within one instance of Call Control, the CH component may only communicate with the CM component. The CM component may communicate with the CH and PC components. All messages between channels must pass between the CM components of each channel.

The CM component may also communicate to the local portion of the distributed router. This interface is used to request a route and to invoke the Call Service Request event once a route is found. In this case, the Remote interface is not used, and instead the Call Service Request from A to B is handled through the distributed router.

Setting up, monitoring, and tearing down calls.
In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.