Synonyms for "more on-call" can include "increased availability," "greater responsibility," "extended duty," and "expanded availability." These terms all describe the need for someone to be available and ready to work at any time, often outside of their normal work hours. "More on-call" implies an increased demand for this type of availability, which can be stressful and demanding for the individual. However, it can also provide opportunities for increased compensation and career advancement. Ultimately, being on-call requires a reliable and responsive attitude, as well as the willingness to prioritize work commitments.