License portability across states has traditionally been the biggest hurdle to a multi-state telemedicine practice. Provide a through discussion of telehealth licensure. Your response should include: 1. an introduction discussing the topic generally 2. a discussion of originating site and distant site and the baseline licensure requirements 3. a discussion of state variability and the three primary categories of state licensure requirements 4. a discussion of the Interstate Medical Licensure Compact 5. a conclusion