Written statements are better than using the phone. Contact the Ombuds if you need assistance in this process. I missed an exam because my team was away. I called the professor in advance and told her, but she won't let me take a make-up exam. Balancing the responsibility of being a team member with your academic requirements is not easy.
Professors have the authority to create their own attendance policy.
Sometimes professors will allow a certain number of excused or unexcused absences. Be careful to read on your syllabus the first day of class to learn what your professor's expectations are. Inform your professor the first week of class what your team game schedule is. Ask if there will be a problem making up tests or quizzes. Call the Athletic Advisor or the Ombuds if you need some assistance in talking with your professor.