The Emer­gency Response Cen­ter (mon­i­tor­ing cen­ter) will call the premis­es for ver­i­fi­ca­tion that the alarm is real, and not a false alarm. If they can­not reach an autho­rized user, a dis­patch will be ordered. Clients can choose which type of response is appro­pri­ate. For a bur­glary sig­nal, it is usu­al­ly police or guard response. For a fire sig­nal, the fire depart­ment will be dis­patched, or the key­hold­er list noti­fied, depend­ing on cir­cum­stance. There are vary­ing charges asso­ci­at­ed with each type of respon­der.