23.0873GPPRelease 17Stage 2TSUser-to-User Signalling (UUS) supplementary service
Figure 11.1 shows the successful cases of transition between the applicable logical states of the service. The state changes are caused by actions of the service provider.
Note that error cases are not shown in the diagram as they normally do not cause a state change. Additionally, some successful requests may not cause a state change and are therefore not shown in the diagram.
Figure 11.1: State transition model