The dream in which you hear a call to a door symbolizes any news. If in a dream you are frightened of a sudden call, be careful as your interests can be betrayed by those whom you considered as the friends. If dreamed you, what are you doing phone call, then the meeting with friends which will bring you chagrin is necessary to you. If you hear an alarm clock call, however, having woken up, understand that it is a dream, then you need to arrange yourself small vacation. Otherwise you risk to get sick from an overstrain.
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.