1.2.1 Call Control Features

The Global Call development software provides the following call control features:

Basic Call Control

Includes basic call control features such as the ability to make a call, detect a call, answer a call, release a call, etc. The implementation of these capabilities is based on the basic call state model, which is a common model for all network technologies. The procedures for establishing and terminating calls differ for the asynchronous and synchronous call models, and are therefore discussed in separate sections of this document. See Section 3.4, "Basic Call Control in Asynchronous Mode" and Section 3.5, "Basic Call Control in Synchronous Mode" for more information on the basic call model.

Advanced Call Model

Defines the behavior for advanced features, such as hold and transfer. These capabilities are provided to support technologies and protocols that support such features, for example, Supervised Transfer. The implementation of these capabilities is based on a more advanced call state model. See Section 3.6, "Advanced Call Control with Call Hold and Transfer" for more information.

Call Progress and Call Analysis

Provides the capabilities for handling pre-connect (Call Progress) information that reports the status of the call connection, such as, busy, no dial tone or no ringback, and post connect (Call Analysis) information that reports the destination party's media type, for example, voice, answering machine, or fax modem. This information is determined by the detection of tones defined specifically for this purpose. See Section 7.1, "Call Analysis" for more information.

Feature Transparency and Extension (FTE)

Provides the ability to extend the capabilities of Global Call to handle features that are specific to a particular technology so that those features are accessible via the Global Call interface. For example, for ISDN applications, Global Call supports supplementary services such as Overlap Send, Overlap Receive, Any Message, Any IE, and User-to-User messaging. See Section 7.3, "Feature Transparency and Extension" for more information.

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