University students are expected to be able to use other source materials, not just their lectures. Also, exercises are there to make you think and find sources.
Whilst I find the problem statement somewhat confusing, the answer about contexts covers material that is very basic. If you don't understand contexts, you really don't understand Asterisk dialplans. Maybe the problem is more complex, but you should be able to tell that.
Autoconfiguration tends to be phone specific, so you need to read the technical documentation for the specific phones that you are using.