Section: 10.5.4.21 Progress indicator
Content: The purpose of the progress indicator information element is to describe an event which has occurred during the life of a call. The progress indicator information element is coded as shown in figure 10.5.107/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  and table 10.5.127/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] . The progress indicator is a type 4 information element with a length of 4 octets. Figure 10.5.107/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Progress indicator information element Table 10.5.127/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Progress indicator information element