Section 700 - Operation576-36-700 DBS 576 (USA) issued October 2000 A-1Appendix A. ARS and TRS OperationIntroductionThis appendix provides an overview of the Toll Restriction Service (TRS) and AutomaticRoute Selection (ARS) features that are available with the DBS 576 PBX.• TRS provides the ability to block selected outgoing calls while allowing others.• ARS automatically finds the lowest cost way to send out a call. This feature issometimes called Least Cost Routing (LCR).With the DBS 576 system, it is possible to utilize TRS without ARS (called TRS) or to utilizeboth TRS and ARS together (called ARS/TRS or simply ARS).Once TRS is set up, it is automatic. Whenever a call is originated, the TRS tables are checkedto see if the call is restricted or not. This restriction is based on the originator and the numberdialed. Separate TRS classes are assigned for Day mode and Night mode.ARS operates when ARS is enabled and the caller dials the first MCO Access Number(usually 9). Direct trunk access and the second to fifth MCO Access numbers (usually 81 to84) do not utilize ARS.ARS use may be required based on the extension originating the call. This is enabled by theForced ARS extension setting.The ARS feature is exceptionally flexible, depending on the implementation plan. Callrouting can consider the day of the year, day of the week, time of day, the originatingextension or trunk and the number dialed. If the preferred route is busy, up to 4 additionalroutes can be considered. When all trunks in a call route are busy, the call can optionally bequeued to continue trying all trunks while moving to the additional routes.Once the trunk group is selected, prefix digits can be deleted and digits added. In addition,digits can be added as a suffix.A high cost toll call warning can also be issued before connecting to a high cost trunk, givingthe caller an opportunity to terminate the call attempt before a higher cost connection isestablished.Both TRS and ARS/TRS utilize various tables that are linked together. These tables togetherdetermine the TRS and ARS/TRS operation. Data must be collected determining thecustomer’s needs, requirements and facilities. Then the data must be analyzed to organize aTRS or ARS plan. This plan must then be implemented using the appropriate TRS or ARS/TRS tables.
