BusinessPhone Communication Platform 5.1
Facilities

## ISDN SS Malicous Call Identification (MCID)

## Definition

The supplementary service MCID enables a user to request that the source of an incoming call is identified and registered by the network.

## Use

This feature is used to investigate the origin of malicious calls.

## Operation

### System telephones

The B-party has two alternatives to activate the MCID function in the public network:

- During the call
- At the end of a call

#### During the call

By pressing the programmed “MCID-key”, the BTU-D/BTU-B_/MFU sends a special message to the public network, which initiates the MCID function in the public network. The public network answers the MCID inquiry by sending different messages, which are interpreted by ASB 150 02 as “MCID accepted” if A-number tracing has been successful or as “MCID rejected”.

If the B-party has not subscribed to the supplementary service and/or the public network failed to record the source of the incoming call, this is interpreted as “MCID rejected”.

The confirmation MCID accepted/rejected will be presented to the telephones with call process tones (acceptance tone and number unobtainable tone).

On the display of the STANDARD, EXECUTIVE or OPERATOR telephone this confirmation is also presented for 3 seconds, and after that the display again presents the corresponding traffic case.

If the B-party does not have a programmed MCID function key, he may also use a procedure to initiate the function.

Initiate inquiry:

1. Press INQUIRY or LINE 2
2. Dial *39#

The public network answers to the inquiry by MCID accepted or MCID rejected. The system translates these two messages into call progress tones (acceptance tone and number unobtainable tone).

The inquiry call is then automatically disconnected. In order to get back to the original call, the respective line key has to be pressed again.

There is no display support, in conjunction with the manual procedure.

#### At the end of a call

If the caller (A-party) disconnects before the “MCID- key” was pressed or the manual procedure was initiated, it is still possible to identify the external caller, before going off-hook.

### ISDN terminal

See User’s Guide.

## Capacity/Limitation

Not applicable

## Programming

### System telephones

0101 |  | Assign facility category

3079 |  | Malicious call id

3049 |  | Program malicious call id

0301 |  | Program Function key

1917 |  | MCID subscribed

### ISDN terminals

1955 |  | MCID activation request allowed from TEs?

## Equipment

BTU-D with ISDN prom set or BTU-B_ or MFU.

Revision: K © Ericsson Enterprise 2003