A method and system for hierarchical prioritization and execution of call completion services are provided. When a caller applies for a call completion service, the caller is identified and assigned a priority from among different priorities such as high priority or regular priority. Thereafter, attempts to execute call completion services are performed hierarchically by launching call completion services for callers having a higher priority before similar attempts are performed for callers of a lower priority. Hence, call completion services are handled according to the priority assigned to the callers rather than the order in which each caller applied for a call completion service.