Your Telephone is idle
This working sample observes the first line assigned to you. You see
What happened here? first the server is connected and your first line is opend to receive notifications about the line. for example lift the receiver of your telephone and the this application reflect the state in the label above.
for a quick overview about the code behind read the source (right-click and View Source). For more complex usecases/examples using this component, see ENetTSC Reference and the various samples shipped with this SDK.