NCAS (Non Call Associated Signaling)

From NENA Knowledge Base

NCAS (Non Call Associated Signaling) is a method for delivery of wireless 9‑1‑1 calls in which the Mobile Directory Number and other call associated data are passed from the Mobile Switching Center to the PSAP outside the voice path.

Also known as:

Non Call-path Associated Signaling

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


  • NENA 05-501, NENA Technical Information Document - SS7 Guidelines for MSC to Selective Router Connectivity
  • NENA-INF-003, NENA Potential Points of Demarcation in NG9-1-1 Networks Information Document

External References


ATIS J-STD-036-C-2 - Addendum to J-STD-036-C, Enhanced Wireless 9-1-1 Phase II