During a Phase 1 wireless 911 call, how many digits are delivered to the PSAP via the selective router?

During a Phase 1 wireless 911 call, how many digits are delivered to the PSAP via the selective router?

• A. Twenty digits.
• B. Ten digits.
• C. Thirty digits.
• D. Fifteen digits.

Answer: (A)

In Phase 1 wireless 911, the selective router delivers two pieces of data to the PSAP: the caller’s Automatic Number Identification (ANI) and the Automatic Location Identification (ALI) tied to that ANI. Each piece is a 10-digit value, so the total delivered to the PSAP via the selective router is 20 digits. This setup lets the PSAP identify who is calling and where the call originated, though it doesn’t provide the precise Phase II location data yet.

In Phase 1 wireless 911, the selective router delivers two pieces of data to the PSAP: the caller’s Automatic Number Identification (ANI) and the Automatic Location Identification (ALI) tied to that ANI. Each piece is a 10-digit value, so the total delivered to the PSAP via the selective router is 20 digits. This setup lets the PSAP identify who is calling and where the call originated, though it doesn’t provide the precise Phase II location data yet.