What identification is unique for a wireless emergency call?

The unique identification for a wireless emergency call is the Emergency Services Routing Key (ESRK). The ESRK is assigned to a specific 911 call when a wireless phone makes an emergency call. This key ensures that the call is routed effectively through the call-processing system to the appropriate Public Safety Answering Point (PSAP).

The ESRK is particularly important because it allows the emergency call to maintain its context as it travels over various networks, including the cellular infrastructure. This is critical in ensuring that responders can be dispatched to the correct location based on the information relayed through the ESRK.

In contrast, Caller ID refers to the telephone number of the calling party but does not provide the necessary routing information that is specific to emergency services. Emergency Response Number can also refer to a unique identifier used by PSAPs but lacks the specificity of the ESRK for wireless calls. Automatic Location Information relates to the technology that can provide the caller's location during an emergency call, but it is not an identification key itself. The ESRK, therefore, stands out as the unique identifier specifically designed for wireless emergency calls, ensuring a reliable emergency response system.