Valid entries for this field can be a trunk access code (TAC), the AAR or the ARS access code, a WNDP access code, or an extension. The extension might be, for example, the firehouse at a base that handles emergency calls. If you use a WNDP access code, use the access code for the lowest precedence calling level in the system.
For more information, see Interactions for Multiple Level Precedence and Preemption.
