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Star Codes and Automatic Route Selection
In some instances, after you dial a star code (a star character followed by a 2- or 3-digit number), the central office provides a second dial tone as a prompt for the dialer to enter more digits. Usually, this second dial tone is immediate. In cases when the second dial tone is delayed, however, calls can be misrouted or system dialing restrictions can be circumvented. (For more information about using Allowed and Disallowed Lists to restrict star codes, see Allowed / Disallowed Lists.)
ARS processes star codes at the beginning of a dialed number and sends the digits to the central office before any other digit analysis occurs. Any programmed prepended digits are added after the star code and before the rest of the telephone number.
ARS cannot route calls that consist only of a star code with no additional digits (such as *44 for voice-activated dialing), because the user has not dialed any digits that the system can use to choose a route.
When prepended digits are used to select facilities other than regular central office lines/trunks, dialing calls with star codes using ARS can cause dropped or misrouted calls. It is recommended that ARS calls containing star codes not be used in configurations where the EXPRESSO system is either behind another switch or used to select non-standard facilities. Star codes are not sent over the network (Hybrid/PBX mode only).
