Which method is used when a call is transferred from one PSAP to another?

The method used when a call is transferred from one Public Safety Answering Point (PSAP) to another is referred to as call referral. This process involves transferring a caller's information and the context of their emergency situation directly to another PSAP that is better suited to handle the particular incident.

In emergency communications, call referral ensures that the necessary details about the call are communicated effectively to avoid delays in response and to ensure a seamless transition in handling the call. It preserves the critical information that operators need to understand the nature of the emergency and the appropriate response necessary.

While the other options describe different concepts in emergency communications – such as call relay, which might involve relaying information from one point to another without a full transfer, direct dispatch, which typically refers to the immediate deployment of resources without transferring the call, and call hold, which simply means placing a call on hold during a conversation – none directly address the process of transferring a call to another PSAP like call referral does.