ESRD stands for Emergency Service Routing Digit. Which statement about ESRD is true?

ESRD stands for Emergency Service Routing Digit. Which statement about ESRD is true?

• A. Identifies a base station, cell site, or sector to route wireless emergency calls; may retrieve ALI data.
• B. Identifies landline facilities for routing.
• C. Provides device GPS coordinates to the PSAP.
• D. Identifies only the base station for routing wireless calls.

Answer: (D)

ESRD is the routing cue used in wireless 911 to send the call to the correct PSAP. It points to the specific radio network element that handles the call—the base station—so the call can be directed along the appropriate path. The function of ESRD is about routing to the right PSAP, not delivering GPS coordinates or pulling ALI data itself. Location data and ALI lookup come from separate systems and processes, not from the ESRD value. Therefore, ESRD identifying only the base station for routing wireless calls is the most accurate description.

ESRD is the routing cue used in wireless 911 to send the call to the correct PSAP. It points to the specific radio network element that handles the call—the base station—so the call can be directed along the appropriate path. The function of ESRD is about routing to the right PSAP, not delivering GPS coordinates or pulling ALI data itself. Location data and ALI lookup come from separate systems and processes, not from the ESRD value. Therefore, ESRD identifying only the base station for routing wireless calls is the most accurate description.