Panasonic Digital Business System 576 Technical Manual

							Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98  291
Appendix A. ARS and TRS Operation
Introduction
This appendix provides an overview of  the Toll Restriction Service (TRS) and Automatic 
Route 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 is 
sometimes called Least Cost Routing (LCR).
With the DBS 576 system, it is possible to utilize TRS without ARS (called TRS) or to utilize 
both 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 checked 
to see if the call is restricted or not. This restriction is based on the originator and the number 
dialed. 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 to 
84) do not utilize ARS. 
ARS use may be required based on the extension originating the call. This is enabled by the 
Forced ARS extension setting.
The ARS feature is exceptionally flexible, depending on the implementation plan. Call 
routing can consider the day of the year, day of the week, time of day, the originating 
extension or trunk and the number dialed. If the preferred route is busy, up to 4 additional 
routes can be considered. When all trunks in a call route are busy, the call can optionally be 
queued 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, giving 
the caller an opportunity to terminate the call attempt before a higher cost connection is 
established.
Both TRS and ARS/TRS utilize various tables that are linked together. These tables together 
determine the TRS and ARS/TRS operation. Data must be collected determining the 
customer’s needs, requirements and facilities. Then the data must be analyzed to organize a 
TRS or ARS plan. This plan must then be implemented using the appropriate TRS or ARS/
TRS tables. 
						

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Appendix A. ARS and TRS Operation Section 700 - Operation
Detailed Description
This section provides a description of the TRS and ARS options on the DBS 576 PBX.
TRS Features
TRS Class Features
Each trunk and extension in the DBS 576 PBX is assigned to one of 50 TRS classes. Each 
TRS class is assigned a Day TRS level and a Night TRS level for each Trunk group. This 
assigned origination party TRS level is compared to the restriction TRS Level determined by 
the dialed number. If the Origination Party TRS level is not higher than the restriction party 
TRS level, the call is denied. 
In addition, each TRS class is assigned settings such as Outgoing Dial Digit Restriction, 
Incoming Dialing Restriction, Outgoing SSD Dialing Restriction, and * and # Dialing 
Restriction.
Outgoing Dialed Digit Maximum
This TRS Class-based parameter sets the maximum number of digits that can be dialed for 
outgoing calls in a TRS Class. The maximum number of digits can be set from 0-20.  When 
set to 0 (default), there is no restriction.
Dialing Restriction During Inbound Calls
Determines whether dialing during an incoming call is restricted on trunks in a TRS Class.
TRS Override on SSD Dialing
Determines whether SSD dialing will override TRS on extensions for a TRS Class.
Star (*) and Pound (#) Dialing Restriction
Determines if the * or # key can be used in dialing for a TRS Class. 
TRS Level for Non-ARS Routing
For each of the 50 TRS classes, an originator ’s TRS level of 0-9 may be assigned for each 
possible trunk group. When a call is originated on a particular trunk group, this value is used 
to determine the originator’s TRS level. From the dialed digits, a restriction TRS level (0-8) 
is determined. If the originator’s TRS level does not exceed the restriction TRS level, the call 
is restricted. The higher the originator ’s TRS level, the less the restriction. If the originator ’s 
TRS level is 0, no outside calls are allowed. If the originator’s TRS level is 9, all outside calls 
are allowed since this always exceeds the restriction TRS value which has a maximum value 
of 8.
Dialing Analysis
When a trunk is accessed, the dialed digits can be analyzed to determine if the call will be toll 
restricted.  
						

							Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98  293
Leading Digits Table
The leading digits table considers the initial dialed digits in determining the restriction TRS level. 
Up to 10 digits can be considered. The digits may be any number 0, 1-9. In addition a wild card (*) may be used 
to occupy any digit position. For instance *11 would consider the numbers 011, 111, 211, 311, 411, 511, 611, 
711, 811, 911. 
When considering the prefix string, the system will always consider the longest exact match first. For instance, 
the prefix string 404 match would be followed before 40.
A wild card is always considered last. For instance if 911 were dialed and both 911 and *11 were prefix strings, 
the 911 would be followed.
If additional digits need to be considered, a prefix ID can be used to cross-reference the Analyze Digits Table.
Once the system determines an exact match, the system will determine from this table the  number of digits that 
are to be  dialed and the restriction TRS level. (There are two other entries in the Leading Digits Table - Route 
Type and Route Number. These are not used for TRS-only operation.)
Note that TRS operation is a match then restrict feature. If there is no match, there is no restriction. Make 
certain that there is a match. As a catch all, use the * wild card.
Note:With TRS is used in a system behind another PBX, the PBX access code does not have to be processed 
by TRS 
Analyze Digits Table
If the Leading Digits Table contains a Prefix ID, the system will consider all appearances of this Prefix ID to 
look for an exact match. Up to 8 digits are considered (in addition to the prefix dial digits).
Once the system determines an exact match, the system determines from this table the number of digits that can 
are expected to be dialed and the restriction TRS level. (There are two other entries in the Analyze Digits Table 
- Route Type and Route Number. There are not used for TRS-only operation.)
ARS/TRS Features
When ARS is used in the DBS 576 system, TRS also operates. 
TRS Class Features
These are the same features as for TRS (see above).  
 TRS Class - ARS Routing
TRS Level
For each of the 50 TRS classes, a TRS Level of 0-9 may be assigned. (This is not done on a Trunk group basis 
since the ARS system determines the trunk group used.)  
When a call is originated, this TRS value is used to determine the originator ’s TRS level. From the dialed 
digits, a restriction TRS level (0-8) is determined. If the originator’s TRS level does not exceed the restriction 
TRS level, the call is restricted. The higher the originator’s TRS level, the less the restriction. If the originator’s 
TRS level is 0, no outside calls are allowed. If the originator’s TRS level is 9, all outside calls are allowed since 
this will always exceed the restriction TRS value (maximum of 8). 
						

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Appendix A. ARS and TRS Operation Section 700 - Operation
ARS Level
An ARS level is also assigned to each of the 50 TRS classes. This originator’s ARS value is used to determine 
if the caller can proceed to use a particular priority route based on the associated ARS requirement in the Route 
List (described later). The originator’s ARS value may be 0-9 where the higher number allows more calling 
access.
Queuing Point
The Route List provides up to 5 route possibilities for handling a call. Each route is considered in a sequential 
order. When the Queuing Point is set to operate, the system will search all previously considered routes and 
then the current route for an available trunk for the Queuing time period.  
Dialing Analysis
When ARS is active, the dialed digits can be analyzed to determine if the call is toll restricted and what type of 
routing the call will follow. 
Leading Digits Table
The leading digits table considers the initial dialed digits in determining the restriction TRS level and ARS 
routing. 
Up to 10 digits can be considered. The digits may be any number 0, 1-9. In addition a wild card (*) may be used 
to occupy any digit position. For instance *11 would consider the numbers 011, 111, 211, 311, 411, 511, 611, 
711, 811, 911. 
When considering the prefix string, the system  considers the longest exact match first. For instance, the prefix 
string 404 match would be followed before 40.
A wild card is always considered last. For instance if 911 were dialed and both 911 and *11 were prefix strings, 
the 911 would be followed.
If additional digits need to be considered, a prefix ID can be used to cross-reference the Analyze Digits Table.
Once the system determines an exact match, the system will determine from this table the  number of digits that 
are expected to be dialed and the restriction TRS level. 
If the TRS level allows the call to proceed, then the route type and its associated pattern number (entry index 
number) are followed. There are three possible route types; the Route Table, the Route List Table and the Time 
List Table. 
Analyze Digits Table
If the Leading Digits Table contains a Prefix ID, the system considers all appearances of this Prefix ID to look 
for an exact match. Up to 8 digits are considered (in addition to the prefix dial digits).
Once the system determines an exact match, the system determines from this table the number of digits 
expected to be dialed and the restriction TRS level.
If the TRS level allows the call to proceed, then the route type and its associated pattern number (entry index 
number) are followed. There are three possible route types; the Route Table, the Route List Table and the Time 
List Table.  
						

							Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98  295
Time List Table
Time List Table is used when the time of day, the day of week or the date affects the desired route. The Time 
List Table allows up to 50 patterns to be entered. Each pattern may specify up to five Route List patterns to used 
based on the current time of day.
Up to four Time List tables may be used. The referenced time list table is determined by the Special Day Table 
or the Day of Week Table. This is useful when rates change for certain days (such as weekend rates versus 
weekday rates).
Route List Table
The Route List Table is used when there are multiple route possibilities. Up to 5 possible route table patterns 
may be considered in sequential priority when attempting to find an available trunk. Before a route is tried, the 
system compares the route ARS to the originator’s ARS level. If the route ARS exceeds the originator’s ARS, 
the call processing will stop and the caller will receive busy tone.
When the call is first presented, the first priority route is tried. If there is no available trunk in the first route and 
queuing point is not enabled the system continues to the next priority route, compares the ARS levels and if 
acceptable checks for an available trunk. If no trunk is available, it will continue to the next priority trunk, and 
so forth until all routes have been attempted. 
If an available trunk is found and warning tone is enable, the system will first issue a warning tone to the caller 
to allow the caller the opportunity to hang up before using a more expensive trunk.
If the queuing point is enabled, the system will wait for an available trunk (beginning with the first priority 
trunk) until the queuing point timer expires before moving to the next possible route.
Route Table
The Route Table provides a simple trunk group selection and selects any digit dialing modification needed. 
This table is directly referenced when there is only one route to use. It is also indirectly reference from the 
Route List Table.
Digit Modify Table
Once a route is selected, the actual dialed digits can be changed based on the Digit Modify Table. Digits can be 
deleted from the beginning of the number (such as removing an unneeded area code), digits can be added to the 
beginning of the number (such as adding an area code or equal access number) and digits can be added to the 
end of a number.
TRS Configuration and Operation
This section provides the following:
• An overview of the TRS operation.
• An example TRS configuration - This is a simple example intended to introduce TRS planning and 
implementation. Example worksheets are included.
• Worksheets for planning and implementing a TRS plan.  
						

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Appendix A. ARS and TRS Operation Section 700 - Operation
TRS Programming/Operation Overview
The purpose of TRS is to restrict outside call origination based on the number dialed and the originator.
As shown in Figure A-4 TRS Operation (Non-ARS) at the end of this appendix, up to 50 TRS Classes settings 
are assigned. When a call is originated, several general settings for the originator are always considered:
•Digit Restriction - This is the maximum number of digits that can be dialed.
•Incoming Dialing Restriction - If this is enabled, an outside call cannot be originated during an 
incoming call.
•Outgoing SSD Dialing Restriction - This determines if SSD dialing is allowed or not.
•Star (*) and Pound (#) Dialing Restriction - This determines if the * and # digits can be outdialed.
When a call is originated, the system determines the TRS class for the originator from either the Trunk Class 
Assignments or the Extension Class Assignments. It then determines the originator TRS level for the trunk 
group selected.
When the call is dialed, the system collects the digits and compares the leading digits to the leading digits table 
entry. The system will look for the longest available exact match. A * may be entered as a wild card for any 
digit position. 
If an exact match is found, the system will look to see if there is a Prefix ID. If so, it will jump to the analyze 
digits table. If not, the system will compare the entered TRS Restriction value to the call originator’s assigned 
TRS level. If the originator’s TRS level is not greater than the Restriction TRS level, the call is denied. 
Otherwise, the call is allowed to proceed. 
						

							Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98  297
Figure A-6.  TRS Flowchart

 	 	



 	

	  
 	 
	 
   
 
 
 	

 


 
 
  

 	

     
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							298 DBS 576 (USA), Revised 6/11/98 576-13-700
Appendix A. ARS and TRS Operation Section 700 - Operation
If the analyze digits table is referenced by a Prefix ID, the system will consider at all entries with the Prefix ID 
and analyze any additional digits dialed. The system will look for the longest exact match. If there is an exact 
match, the system compares the entered TRS Restriction value to the call originator’s assigned TRS level. If the 
Restriction value is equal to or greater than the originator’s TRS level, the call is denied. Otherwise, the call is 
allowed to proceed.
Example TRS Configuration
As an example of setting up TRS, assume that XYZ Department Store is using the DBS 576 PBX.
Situation 
This example installation has the following considerations:
• Only one tenant (one MCO tenant group operation)
• 75 retail floor store phones
•  restricted to local telephone use only except for 1800, 1888 and calls to Birmingham, Alabama 
where a sister store and many suppliers are located
•  restrict special calling numbers (976, 1900, outside operator, etc.)
•  911 always allowed
• 40 general office phones
•  long distance allowed during day mode
•  restrict special calling numbers (976, 1900, outside operator, etc.)
•  911 always allowed
• 10 purchaser/buyer telephones
•  no time restriction
•  restrict special calling numbers (976, 1900, outside operator, etc.)
•  911 always allowed
• 25 executive office telephones
•  no time restriction
•  no calling restrictions
• 2 attendant group phones
•  no restrictions during the day
•  local calls only at night to prevent abuse
• 7 warehouse phones
•  extension and 911 emergency calling only
• Trunks 1-24 are in Trunk Group 1 and are to the local CO for local calls. In addition, long distance 
carriers are accessed using these trunks. 
						

							Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98  299
Implementation
The configuration of this system is described in the following steps: 
1.  The system needs are listed in Table 1, “Example - User Needs Worksheet,” on page 300.
Most of the information is straight forward. The Day TRS and Night TRS classes are determined by 
assigning consecutive Class numbers to each unique calling need. When a duplicate need is encountered, 
the same class number is assigned.
The system trunk equipment is listed in Table 2, “Example - MCO Tenant/Trunk Groups Worksheet,” on 
page 301. 
						

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Appendix A. ARS and TRS Operation Section 700 - Operation
Table A-1.   Example - User Needs Worksheet
a. After all user data has been entered, then assign class numbers. 
Tenant Name XYZ Department Stores     Tenant #   1   (1-72)
User Type
(office,  
executive, lobby)User Extension 
(or Trunk) Ports 
(BSSC) and 
NumbersDay Calling Needs
(Long Distance, 411, 
specific number, etc.)Night Calling Needs
(Long Distance, 411, 
specific number, etc.)Day TRS 
Classa
(1-50)Night TRS 
Class
a 
(1-50)
Executive 1101-1125 No Restrictions No Restrictions 1 1
Buyers 1166 - 1175 No Restrictions except 
special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)No Restrictions except 
special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)22
General Office 1126-1165 Long Distance Allowed
No special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)Local calls only
No special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)
Allowed to call Birmingham34
Attendant Group 1176-1177 No Restriction Local calls only
No special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)
Allowed to call Birmingham14
Retail floor 1178-1253 Local calls only
No special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)
Allowed to call BirminghamLocal calls only
No special numbers (976, 
1900, 411, operator access, 
collect calls, etc.)
Allowed to call Birmingham44
Warehouse 1254-1260 Extension calling and 
emergency calling onlyExtension calling and 
emergency calling only55