public class StrategyDemo {

        public static void main(String[] args) {

            Phone ipPhone = new IPPhone("1234", "ProviderA");
            Phone tdmPhone = new TDMPhone("4567", "ProviderB");

            ipPhone.getRecordingResource();
            tdmPhone.getRecordingResource();

            ipPhone.setRecordingResource(Resource.IPRecorderIP2);
            ipPhone.getRecordingResource();

        }

    }