2.6. gc_Extension( )

The gc_Extension( ) function is provided as a generic Global Call interface to allow applications to easily access and use technology-specific features. The function provides a common unified Global Call API for technology-unique features that formerly required the support of the lower-level call control library APIs.

The ext_id parameter of the gc_Extension( ) function specifies the particular extension function of the Call Control library to be executed. The ISDN call control library has multiple extension IDs defined. For details on each Extension ID, refer to Section 1.7, ISDN Extension IDs.

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