# Using the H.324M structure reference

This section provides an alphabetical reference to the structures used by H.324M functions in the 3G-324M Interface. The topics in the structure reference include the structure definition and a table of field descriptions.

The table below lists the H.324M structures by function and event. Only those functions and events that have associated structures are included in the list.

H.324M functions and events | Associated structures
H324EVN_FAST_CALL_SETUP_DONE | H324_FAST_CALL_SETUP_PARAMS
H324EVN_H223_SKEW_INDICATION | H324_H223_SKEW_INDICATION
H324EVN_LCD | H324_LCD
h324Start | H324_START_PARAMS
h324SetTermCaps H324EVN_REMOTE_CAPABILITIES | H324_TERM_CAPS
h324UserIndication H324EVN_USER_INDICATION | H324_USER_INPUT_INDICATION
h324VendorIDIndication H324EVN_VENDOR_INDICATION | H324_VENDORID_INDICATION
H324EVN_VIDEOTEMPORALSPATIALTRADEOFF _INDICATION | H324_VIDEOTEMPORALSPATIALTRADEOFF _INDICATION

Note: In this reference, the H324_BOOL data type is equivalent to the Boolean data type.