1.7. ISDN Extension IDs

GlobalCall provides a common interface to multiple network interface libraries for features that are abstracted across multiple call control libraries. The Feature Transparency and Extension (FTE) module of GlobalCall provides the flexibility to extend the GlobalCall API to access all technology or protocol-specific features unique to any given network interface. For further details, refer to the GlobalCall Application Developer's Guide.

To use one of these supported features directly through the GlobalCall API, the gc_Extension( ) function is called with an extension function identifier, ext_id, defined in this section for ISDN. If the extension function is supported and called in asynchronous mode, relevant information or network event notification is returned via the call control library through an extension event, GCEV_EXTENSION. For more information on the gc_Extension( ) function and GCEV_EXTENSION, refer to the GlobalCall Application Developer's Guide.

Table3 gives provides a list of the extension IDs for ISDN and indicates whether the ID is supported in synchronous and/or asynchronous mode, and if there are termination events.

Table 3. ISDN Extension IDs

Extension ID	Mode	Termination Event
GCIS_EXID_CALLPROGRESS	Sync	No
GCIS_EXID_GETBCHANSTATE	Sync	No
GCIS_EXID_GETDCHANSTATE	Sync	No
GCIS_EXID_GETDLINKSTATE	Sync	No
GCIS_EXID_GETENDPOINT	Sync	No
GCIS_EXID_GETFRAME	Sync	No
GCIS_EXID_GETNETCRV	Sync	No
GCIS_EXID_GETNONCALLMSG	Sync	No
GCIS_EXID_PLAYTONE	Sync, Async	Yes
GCIS_EXID_SETDLINKSTATE	Sync	No
GCIS_EXID_SNDFRAME	Sync	No
GCIS_EXID_SNDMSG	Sync	No
GCIS_EXID_SNDNONCALLMSG	Sync	No
GCIS_EXID_STOPTONE	Sync, Async	Yes
GCIS_EXID_TONEREDEFINE	None	Yes

The following sections describe the ISDN extension IDs (ext_id) and provide additional information related to their input parameters, as well as cautions, if applicable, and example codes. The set and parameter IDs are described in Section1.13, ISDN-Specific Parameter Sets.

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