1.9 Automatic Route Selection (ARS) Features78 Feature Guide[Carrier Selection Procedure Flowchart]The numbers in parentheses indicate the corresponding items found under [ProgrammingProcedures] on the following pages.[Programming Procedures]1. ARS Mode ( ARS Mode [320])ARS is turned on by selecting under which circumstances it operates – either when anextension user makes a call using the Idle Line Access method, or when any CO LineAccess method is used. ( 1.5.5.3 CO Line Access). ARS can also be turned off for theentire system.2. Leading Number Exception TableOnce ARS is activated, store the telephone numbers that will bypass ARS in the LeadingNumber Exception Table.Note that the first few digits (leading number) of a telephone number, such as an area codeor local exchange, can also be stored, so that all calls to those areas or exchanges areexempted from ARS. Also note that the CO Line Access number is always ignored by ARSNoNo (Normal CO Line Access)NoNoYesIs the ARS mode (1) enabled?An extension user accesses a COline and dials a telephone number.Sends areorder tone.Sends abusy tone.Checks the Routing Plan (4) todetermine which carrier to use.Modifies the dialed number byremoving the digits and followingthe modify commands (5).Sends the modified numberto the CO line.YesNoIs the carrier found in theappropriate time block (4)?YesIs the dialed number found in theLeading Number Exception Table (2)?NoYes(default)Yes Is normalCO Line Accessallowed?Because all COlines are busy?YesIs the dialed number found inthe Leading Number Table (3)?NoIs there an availableCO line group (5)?YesSends the telephonenumber by the IdleLine Access.Sends the telephonenumber as dialed.
