3.6.1 Advanced Call State Model Overview

The advanced call model provides additional call control functionality over the basic call model, adding the ability to transfer calls, place calls on hold and retrieve calls on hold. This section provides brief descriptions of the API functions used to hold, retrieve, and transfer calls and describes the call state transitions that occur when the functions are used. This section also provides figures that illustrate the call state transitions for advanced call model functions.

Note: The hold, retrieve, and transfer functions are supported by particular protocols for the ISDN, E-1 (PDKRT only) and T-1 (PDKRT only) technologies. For more information, see the function descriptions in the Global Call API Library Reference and the appropriate Global Call Technology User's Guide.

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