NCAS (Non Call Associated Signaling)

NCAS (Non Call-path 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.


 * 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