What enables the one-button transfer capability of a call with ALI information to another PSAP?

The one-button transfer capability of a call with Automatic Location Identification (ALI) information to another Public Safety Answering Point (PSAP) is primarily facilitated by the selective router.

Selective routers are designed to efficiently route emergency calls to the appropriate PSAP, ensuring that the call takes into account the caller's location as provided by the ALI data. This capability is crucial, especially in emergency situations where timely and accurate information transfer can significantly impact response times and the effectiveness of the emergency service. When a call needs to be transferred from one PSAP to another, the selective router enables this seamless transition by retaining the ALI information, allowing the receiving PSAP to have immediate access to the necessary location data without requiring the caller to repeat it.

In contrast, options such as emergency call routing and automatic call distribution, while related to call management, do not specifically provide the one-button transfer capability for retaining ALI information. The communications processor plays a role in managing various aspects of call handling but does not directly enable the selective transfer function associated with ALI data. Thus, the selective router is key to maintaining efficient and precise emergency communication during transfers between PSAPs.