The agency does. Finding cover is the agency's job, not the client's. A good call-out process has three steps: record the call-out against the job so attendance stays accurate; offer the job to qualified, available Crew Members first, starting with people who have the right skill and certification and are close to the site; and confirm the replacement with the client before the start time. Filling the gap is called
shift coverage, and the replacement is a
backfill. In NextCrew, a coordinator can message the right group in one step, by skill, certification, location, proximity or who is working today, over SMS, email and push, and two-way SMS replies come back on the Crew Member's record.