Final answer:
A 9-1-1 call that disconnects after reaching PSAP or the call taker, or if it disconnects before reaching and no contact can be made, is known as an Abandoned call. These calls are treated as potential emergencies by emergency services.
Step-by-step explanation:
When a telephone call on 9-1-1 has disconnected after reaching the Public Safety Answering Point (PSAP) or a Call Taker, or if the call disconnects before reaching the PSAP and the Call Taker cannot make contact with anyone at the call's location, it is referred to as an Abandoned call. These calls are a concern for emergency services because each must be treated as a potential emergency, requiring that the situation be assessed which may include sending responders to the call's origin. This can divert resources away from actual emergencies if the call was not intentional or the situation has resolved before contact is re-established.