# Advanced Automatic Route Selection Example

This example describes the data entry required for a system installed in a headquarters in London UK.

The company has three locations in the UK:

- the Headquarters in London

- a Service Center in Edinburgh

- a factory in Cardiff

### Trunk Groups

The system in London is connected to the public network by five trunk groups, as follows:

- Trunk Group 1. British Telecom Exchange Lines, first digit 9

- Trunk Group 2. Private Circuits to Edinburgh, first digits 71

- Trunk Group 3. Private Circuits to Cardiff, first digits 72

- Trunk Group 4. Direct access to the Mercury Network, first digit 9

- Trunk Group 5. Indirect access to the Mercury Network via British Telecom exchange lines, first digits 9131 followed by a ten-digit PIN number.

The following guidelines apply in this example when working out alternative routes:

1. When making a call from London to Cardiff, the first choice route is route 3 (Private Circuit), second choice route is route 4 (Direct access Mercury circuits), third choice route is route 1 (BT Exchange Lines).

2. When making a call from London to Edinburgh, the first choice route is route 2 (Private Circuit), second choice route is route 4 (Direct access Mercury circuits), third choice route is route 1 (BT Exchange Lines).

3. When making other calls from London, the first choice route is route 4 (Direct access Mercury circuits), second choice route is route 1 (BT Exchange Lines), and third choice is route 5 (indirect access to Mercury circuits via BT Exchange lines).

### Forms

From the information supplied, some of the data entry forms can be completed. Draw a sketch of the example network to assist in completing the forms. Paper data entry forms can be completed in any order to suit the installer, but system Data Entry MUST be completed in the following order:

1. ARS Call Progress Tone Detection

2. ARS Digit Modification Plans

3. Class of Restriction Groups

4. ARS Day and Time Zones

5. ARS Routes

6. ARS Route Lists

7. ARS Route Plans

8. ARS Leading Digits

9. ARS Digits Dialed

NOTE: If data is entered when a pre-requisite form has not had data entered, the system will display a warning and will not COMMIT the data.

### ARS Call Progress Tone Detection Form

Fill in the ARS Call Progress Tone Detection forms to accommodate the requirements of the known trunk groups. A maximum of 100 forms are available, (0-99).

- Enter tone plan number 1.

- Enter Maximum wait for a tone 5.

- Enter action on time-out, Busy Tone.

- Enter tone to detect, UK Precise Dial Tone.

- Enter action to take Outpulse DTMF.

### ARS Digit Modification Plans Form

Fill in the ARS Digit Modification Plans form as follows:

- Next to digit modification number 1, enter number of digits to absorb 1.
  No digits to be inserted, and no final tone plan.

- Next to digit modification number 2, enter number of digits to absorb 2.
  No digits to be inserted, and no final tone plan.

- Next to digit modification number 3, enter number of digits to absorb 2.
  No digits to be inserted, and no final tone plan.

- Next to digit modification number 4, enter number of digits to absorb 1.
  No digits to be inserted, and no final tone plan.

- Next to digit modification number 5, enter number of digits to absorb 14.
  No digits to be inserted, and no final tone plan.

### Class of Restriction Groups Form

Use a worksheet or blank sheet of paper to tabulate the different levels of user access required. For example, this could include "Directors" who have unrestricted access to all numbers, "Clerks" who only have access to local and 999 calls, and "Others" who only have access to 999 calls.

When this worksheet is filled in, identify any users on the form who use the same route through the switch. These users can be given the same Route number, in this case Route 2. Similarly, others using the same restriction route can be given the same Route number, in this case Route 3.

These Route numbers are then written as Class of Restriction Group numbers, ready to be transferred to the Class of Restriction Groups form. Fill in the forms in the following order:

- directory inquiry numbers and local Exchange codes,

- codes which provide unrestricted access to routes, ie, 0 and 0171,

- specific route codes,

- private circuits,

- calls to be completed via direct access Mercury circuits,

- calls to be completed via indirect access Mercury circuits.

As each digit string is entered, specify the number of digits to follow in the "Digits to Follow" column of the Automatic Route Selection form.

### ARS Day and Time Zones Form

Fill in the ARS Day and Time Zones form as follows:

- Enter day and time zone number 1.

- Enter days in Day Zone 1 as MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY. In Day Zone 2, enter SATURDAY and in Day Zone 3, enter SUNDAY.

- In Time Zone 1 enter 9-12.

- In Time Zone 2 enter 13-17.

- In Time Zone 3 enter 18-23.

- In Time Zone 4 enter 0-8.

NOTE: Time can only be entered in full hours. Where an hour appears on the form it runs until that hour plus 59 minutes, 59 seconds. So, where 9-12 is entered, the time span is from 09:00 until 12:59:59. A time zone cannot run from, say 1800 until 0800. It must be split into two zones. The first zone runs from 18-23, the second from 0-7.

### ARS Routes Form

Fill in the Trunk Group numbers on the ARS Routes form so that Route 1 is Trunk Group 1, Route 2 is Trunk Group 2, and so on.

- Fill in the Class of Restriction numbers so that Route 1 is COR 1, and so on.

- Fill in the Digit Modification Number, so that Route 1 is Digit Modification number 1, and so on.

- Digits Before Outpulsing - Leave this field blank. Digits will be outpulsed as soon as they are received.

### ARS Route Lists Form

Using the Trunk Group guidelines, fill in the ARS Route Lists form. List these routes in order of cost with the cheapest route first. Enter " Y" for warning tone if a more expensive route is selected.

- For List 1 enter, 3, 4, Y, 1.

- For List 2 enter, 2, 4, Y, 1.

- For List 3 enter, 4, 1.

- For List 4 enter, 1, 4, 5.

### ARS Route Plans Form

Fill in the ARS Route Plans form as follows:

- Enter 1 for the first Route Plan Number. Enter 1 for the first Day and Time Zone number.

- In Zone 1 termination enter the word LIST and the list number 4. (At this time of day the BT Exchange Line is cheaper than the Mercury line.) All the other zone terminations are entered as L 3, since Mercury lines are then cheaper than BT Exchange Lines.

### ARS Leading Digits

List the leading digits to be used in the system in the ARS Leading Digits form. In the example these are 9, 9131 (plus the ten-digit PIN number), 71 and 72. Fill in a different form for each leading digit.

ARS Digits Dialed

For leading digits 9

Leading digits 9

Enter " Y" for Secondary Dial Tone

For digits dialed, leave this blank

For digits to follow, enter UNKNOWN

For termination, enter P 1.

For leading digits 9131 enter:

Leading digits 9131

Enter " Y" for Secondary Dial Tone

For digits dialed, leave this blank

For number of digits to follow, enter UNKNOWN

For Termination, enter L 3.

For leading digits 71 enter:

Leading digits 71

Enter " Y" for Secondary Dial Tone

For digits dialed, leave this blank

For number of digits to follow, enter 4

For Termination, enter L 2.

For leading digits 72 enter:

Enter leading digits 72

Enter " Y" for Secondary Dial Tone

For digits dialed, leave this blank

For number of digits to follow, enter 4

For termination, enter L 1.

### Result

The following text describes how a call progresses through the switch by using Automatic Route Selection. This example uses the data that was entered in the programming example.

An extension user in London dials 72 4000 to call an extension in Cardiff. Leading digit 72 is the access code for the Private Wire to Cardiff. The Automatic Route Selection form terminates this call on PLAN 1.

Route Plan 1 is linked to Day and Time Zone 1, so the call is next directed to LIST 1. In Route List 1 the first choice route is the Private Wire to Cardiff which is ROUTE 3. If for example, this first choice route is busy, the system will attempt to access the second choice route. This is ROUTE 4, Trunk Group 4, which are a public network operator's direct lines. Finally, if this route is busy the call is directed to ROUTE 5 which are indirect connections to the public network via British Telecom.

To be able to use this route, digit modifications are needed. The system refer to the Digit Modification number on the ARS Routes form, then to the ARS Digit Modification Plans form. This form tells the system to absorb the leading digits 72 and detect tone 99. For the purpose of this example, tone 99 is the public network operator's dial tone. When this is detected by the system it outpulses 01222xxxxxx, which is the public network operator's number to the Cardiff site. The call arrives at the Cardiff site and the operator connects London to extension 4000.

Related Topics

- Advanced Automatic Route Selection Description

- Advanced Automatic Route Selection Features

- Advanced Automatic Route Selection Programming