The NENA NG9-1-1 Call Processing Metrics Standard defines normalized NG9‑1‑1 call processing metrics for computing useful statistics so that independent implementations can derive the same comparable measurements. Call processing metrics are measurements between events in the call processing chain and are used to drive reporting, analysis, and real‑time monitoring.
The NENA E9-1-1 PSAP Equipment Standard defines the PSAP equipment requirements intended for use by users, manufacturers, and providers of E9‑1‑1 Customer Premises Equipment (CPE). This document is only applicable to E9‑1‑1 systems. NG9‑1‑1 systems have different requirements and meet different NENA standards. An NG9‑1‑1 LPG (Legacy PSAP Gateway) would be expected to conform with the E9‑1‑1 PSAP interfaces described in this document.