BusinessPhone Communication Platform 6.0
Facilities

## Croatia – Adaptation Of The CN Numbering Plan

## Definition

This feature increases the numbering plan functionality for Corporate Networks by using virtual 5-8 digit numbers for the internal ASB 150 02 numbering structure.

## Use

The feature was designed for the Corporate Network (CN) of the Ministry of the Interior of the Rebublic of Croatia, on condition that all systems of the CN support a 5-digit internal numbering plan.

The feature can also be used in other CN networks where it is required to support by the PBXs an internal numbering structure of up to eight digits. However we recommend to consider the limitations of the feature (see separate chapter) before offering this solution to the customer, because this is a solution with a virtual numbering plan, and most of the internal functionalities cannot be applied to virtual numbers.

## Operation

To handle the virtual numbers in the system, a number translation of the sent calling/connected CN number as well as of the received CN number is necessary.

The number translation for outgoing calls is done by using the 4-digit internal directory number, commands 2073 and 2074 for removing and prefixing digits, respectively a common abbreviated number for the number conversion at incoming calls terminated within the own system.

### Outgoing CN calls

The composition of the virtual directory number being sent out to the CN is done in the following way:

Up to 3 digits of the internal directory number can be removed (command 2073) and prefixed with up to four digits of the Local Private Code (LPC, command 2074).

- (LOC) + LPC + “edited directory number”

LOC |  | is the own Location Code which is sent to the CN in case of number types “unknown” and “regional level 1”

LPC |  | is a non diallable number in the system, it is only used for prefixing

#### Example

Virtual number plan of the PBX: |  | 54000-54999 |
Internal directory number plan: |  | 1000-1999 |
Local Private Code: |  | 54 |
Number presentation at RL0
Directory number: |  | 1234 |
Digits to be removed: |  | 1 |
“Edited directory number”: |  | 234 |
Local Private Code: |  | 54 |
Virtual number (presented CN number): |  | 54234 |
Number presentation at RL1
Directory number: |  | 1234 |
Digits to be removed: |  | 1 |
“Edited directory number”: |  | 234 |
Local Private Code: |  | 54 |
Location Code: |  | 876 |
Virtual number (presented CN number): |  | 87654234 |

### Incoming CN call

In case of incoming calls, the LPC has to be removed and replaced by digits available in the internal directory number plan. The replacement is done by using a programmed common abbreviated number which must be equal to the LPC. The number assigned to the common abbreviated number contains the leading digits of the internal directory number which will be combined with the remaining digits of the incoming call.

#### Example (same as above for outgoing calls)

virtual number plan of the PBX: |  | 54000-54999 |
Internal directory number plan: |  | 1000-1999 |
Abbreviated number: |  | 54 |
with assigned number: |  | 1 |
Number presentation at RL0
Called CN number |  | 54234 |
Abbreviated number |  | 54 |
converts the leading digits to a digit available in the internal number plan |  | 1 |
remaining digits of the dialled no. |  | 234 |
Directory number |  | 1234 |
Number presentation at RL1
Called CN number |  | 87654234 |
LOC is detected and removed: |  | 876 |
Abbreviated number |  | 54 |
converts the leading digits to a digit available in the internal number plan |  | 1 |
remaining digits of the dialled no. |  | 234 |
Directory number |  | 1234 |

## Capacity

Not applicable

## Limitations

The implementation of the virtual numbering plan is based on a composition of the internal 4-digit directory number plan and the LPC, in order to simulate an up to 8-digit numbering plan for the CN.

The virtual numbering plan can be used for the internal basic call handling (common abbreviated number handles the number conversion also internally), but not for the execution/programming of most of the internal features, such as:

- Abbreviated number dialling common numbers
- Bypass Call diversion and follow me
- Call information logging
- Call metering
- Call pick up common
- Call pick up extension group
- DISA
- Diversion (direct/busy/on no reply)
- Display of the own virtual number
- Display of the called/calling virtual number
  in case of internal calls
- Follow me
- Group (PBX) hunting
- Hotline
- Hotel guest room telephone
- Intercom
- Key system function
- Loudspeaker paging
- Mailbox system common
- Mailbox system individual
- Message system voice
- Message system call me
- Message system text
- Name selection
- Secretary function
- Supervision
- Telephone directory

In order to use the features listed above, the internal
4-digit numbering plan has to be used. This situation might confuse some users, because they have different directory numbers for internal and CN call handling.

The total number length of the LOC and the virtual directory number within the Corporate Network must not exceed 8 digits.

## Programming

The following commands are only accessible via BMS:

### Composition of virtual numbers (calling/connected number) presented to the CN network for outgoing calls

2073 |  | Removed digits for composing A or B number

2074 |  | Local private code for composing A or B number

### Conversion of the virtual numbers received from CN to the internal directory number plan

5413 |  | Create abbreviated number series

2501 |  | Translated number

2502 |  | Categorisation

2503 |  | Categorisation

2504 |  | Categorisation

2505 |  | Categorisation

0105 |  | Abbreviated number category for extension

2801 |  | Short number open for tenant

1005 |  | Abbreviated number category for trunks

## Equipment

### Hardware, Software

BTU-D with ISDN Prom set, BTU-B or MFU.

The feature is supported by ASB 150 02 R10 or higher system releases.

### Licensing

As this feature belongs to the digital networking features, the proper licensing concept has to be used, see Facility Description – General (155 34-ASB 150 02 Uen), chapter ASB150 02 Licensing.

Revision: D © Ericsson Enterprise 2004