Signaling parameters are passed between the application and the ISUP task in the form of events. The following table provides a description of the signaling parameter components:
Component |
Description |
Events |
Fixed format structures consisting of one or more information elements (IE). |
Information elements |
Fixed format structures consisting of a flag indicating their presence or absence from the corresponding ISUP message, and one or more tokens, or fields. |
Token |
Structure consisting of a flag indicating its presence or absence, possible filler to ensure proper byte alignment, and a value. |
The following structure simplifies applications by enabling them to operate on fixed format structures rather than the variable length and variable formats employed by the ISUP protocol.