What should a doctor do if they are called during prayer—obligatory or supererogatory—and they do not know whether the caller is concerning a critical case or not?

The one who is summoned should coordinate with the one who summons him to distinguish emergency cases that necessitate breaking the prayer from others. If coordination is not possible, he should break the prayer if it is customary that the summons is only for an important emergency. Otherwise, he should complete his prayer if he predominantly believes there is someone to take his place or that a slight delay will not cause harm. However, if he predominantly believes that the situation will be harmed, he must break his prayer or complete it quickly. The default is to complete the prayer with brevity, and breaking the prayer is permissible to save a life from perishing or to avert danger. Breaking a supererogatory prayer is easier and more permissible than breaking a obligatory prayer.