ISC (International Service Center) has only one function, to send mail on its way to the next location. Since some sorting operations take place only once a day, no package should be there for 24 hours. What confuses people is that after it is done there, it will be in transport, where tracking is not able to be done. Parcel tracking is done on machines at postal facilities.
Not to be confused with Psychologist. A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of mental disorders.
Psychiatrists are medical doctors who have received special additional training in mental health. To become a psychiatrist, it is therefore mandatory to first attend medical school and then complete a residency and fellowship training program in psychiatry. Psychiatrists usually treat patients with severe mental illnesses such as schizophrenia or other psychoses.