CAS (Call/CallPath/Channel Associated Signaling)

Call Associated Signaling

Allows for the device position or location information to be delivered to the emergency services network in the call signaling as part of the call setup information. With Call Associated Signaling, the originating network pushes the position information to an ESNE (Emergency Services Network Entity).

CallPath Associated Signaling

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 via the voice path.

Channel Associated Signaling

An option for the signaling channel (time slot 16) of an E1 interface; ITU G.704. Used on digital interfaces for signaling.


 * 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