The notation of 'Figure 14.7 Composite State with two States' shows some states for dialing a telephone number, with a composite state
Dialing, some sub-states
Start and Partial Dial, some entry and exit Behaviors, and some (apparently Operation-driven) Transitions and a guard.
This offers itself as a nice case study for showing how Activities can be used to drive State changes in Magic Model Analyst® (Cameo Simulation Toolkit®). To simulate that deceptively simple looking composite state
Dialing we are, however, going to have to build a quite substantial little eco-system around it, and we'll learn a lot along the way.