The 911 service is typically very complex, involving many partners. It involves a telephone company; it involves a dispatch centre; it involves at least three public services—police, fire, and ambulance—and in some cases more.
Le service 911 est très complexe et comprend de nombreux partenaires: la compagnie de téléphone, le centre de répartition, au moins trois services publics—la police, le service d'incendie et le service ambulancier—et parfois d'autres encore.