OPX (Off-Premises Extension)

From NENA Knowledge Base

OPX (Off-Premises Extension) is a dedicated circuit connecting a distant location to a main PBX to provide the same phone system features available at the main location.

Relevant NENA Documents
Note: To find and download the document, copy the document number (like STA-010) from below and search the NENA Standards and Documents page.

NENA-STA-015, NENA Standard Data Formats for 9‑1‑1 Data Exchange & GIS Mapping

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