Focus on the pronunciation of call
English definition of “call”
/kɔl/ n [C] (BEING ASKED TO COME)
› a visit that someone makes, esp. as part of a job: The locksmith is out on a call right now. on call › People who work in medicine and other important activities are said to be on call when they are available to make visits or to speak to someone on the telephone at any time: Dr. Menendez is on call for the next 24 hours.