BusinessPhone Communication Platform 4.0
Facilities

## A-number Transfer Via MFC

## Definition

In some countries where MFC signalling is used, the public network also provides the A-number to the customer.

In this case the A-number of the external party is shown on the system telephones.

## Use

A-Number transfer via MFC is used to show the number of the external calling party on the display.

## Operation

If the public network provides the A-number, in case of an incoming call the number of the calling party will be presented on the display of the telephone, e.g.:

    "01811003765 CALLING"

If the public network does not provide the A-number of the calling party, only the trunk number will be shown, e.g.:

    "EXTERNAL   701   CALLING"

## Capacity

It depends on the programming of the actual used trunk line and on it’s public subscriber number how the A-number is displayed. 32 different public numbers can be assigned to the trunks. Up to 16 digits can be programmed per public number.

## Limitations

For MFC only the A-number of the calling party will be send out. In case of an incoming call the number of the connected party will not be sent out.

To program a public directory number only digits 0 - 9 are valid.

#### DISA

In case of DISA the external caller has to state his internal directory number and also a password.

When the external caller builds up an external call again, the entered internal directory number will be used in the A-number which will be sent out to the public net.

The accumulated costs for each call will be assigned to the entered extension number.

#### Simplified DISA for Denmark

If an external caller, answered by the simplified DISA function builds up a new external call the public number of the outgoing trunk will be used in the A-number which will be sent out to the public net.

The accumulated costs for the transferred call will be assigned to the incoming trunk.

#### Transfer of an incoming external call to another external destination

The directory number of the extension which build up the second external call and the transfer, will be used in the A-number which will be sent out to the public net.

The accumulated costs for the transferred call will be assigned to the orginator.

#### Connecting of two outgoing external calls

The directory number which connected the two outgoing lines will be used on both lines in the A‑number which will be sent out to the public network.

The accumulated costs on both lines will be assigned to the orginator of the trunk-trunk connection.

#### Tie line traffic

If an outgoing external call is built up by a tie line to a subsystem, the incoming tie line number will be used in the A-number which will be sent out to the public network.

The accumulated costs for the transit call will be assigned to the tie line.

#### External call diversion / follow me using a common abbreviated number

In case of an incoming call to an external diverted extension the directory number of the diverting extension will be used on both lines in the number which will be sent out to the public network.

The accumulated costs for the outgoing line will be assigned to the diverting extension.

## Programming

On system level we define a table with up to 32 different public numbers (command 2220 ) which will be used in case of outgoing calls; one public number per number group. In addition the type of the programmed number has to be specified ( national, subscriber,... ). Which number type has to be sent out depends on the public network. With the information on the individual trunk about the trunk number group it is possible to find the corresponding public number in the table. Finally the opposite parties directory number will be added.

0169 |  | Directory number subscribed in PSTN ?

Following commands are only executable via BMS/RASC:

1801 |  | Common number at automatic outgoing/incoming traffic

2220 |  | Public number

1030 |  | Public number group

1312 |  | MFC signal scheme

## Equipment

The A-Number transfer via MFC function can be used with a BTU-A together with REG (4 MFC and MFE registers) or a BTU-D (4 MFC registers).

Use tie-lines with a BTU-C or BTU-E.

Revision: C © Ericsson Enterprise 2003