(Page 1 of 57 in this chapter) Version

Appendix A

Extended Data Structures

This appendix lists and describes each of the supplementary service extended data structures and substructures. The structures are listed in alphabetical order.

This section lists structures that are referenced in one or more of the service-specific structures. They are defined in isdnacu.h. The structures are listed in alphabetical order.
Each of these structures contains an invoke field. The invoke field is used to indicate the presence or absence of useful data in the structure. If the field is set to ON, then the stack uses the information in the structure. Otherwise, the information in the structure is ignored. If the successful invocation of the service requires the inclusion of the parameter, and the invoke field is OFF, then the service request is rejected.
Some structures contain a reference to a string location and string length. The string location is specified using the offset field. This offset value is calculated from the address of the structure containing the offset field.
The len field in a structure contains the length of the data. There is no requirement to null-terminate the string. Note that structures sent from the stack do not include null terminations.
These structures are defined to be 8-byte aligned.

(Page 1 of 57 in this chapter) Version

Want to send us feedback on our documentation? Email: Tech_Pubs@nmss.com