Signaling parameters

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.