BusinessPhone Communication Platform 4.0
Facilities

## Intrusion

## Definition

Intrusion denotes the possibility for an extension or OPERATOR who encounters busy, via a procedure, to intrude on the busy connection.

## Use

The function is valuable for those who extend incoming external traffic.

The function gives the person extending the call the possibility to announce an important incoming call to a busy extension.

## Operation

### All telephones

#### To initiate intrusion

When busy is encountered, one dials the digit for the intrusion facility (normally “8”) or a programmed name selection key.

On the EXECUTIVE Telephone the user may press the menu key intrusion.

If the prerequisites for intrusion are complied with, the intruder will join the ongoing call as third party.

All parties hear warning tone throughout the intrusion (connection) phase.

Note

Intrusion can be prevented even if the menu text is shown, due to categorisation or because the traffic situation does not permit intrusion.

If the extension is not authorized to effect intrusion the key depression will be ignored and the extension user will continue to receive busy tone.

#### To end intrusion

When an intrusion ends, the seized speech paths are released via the conference circuit and the remaining parties continue their conversation via a normal speech (voice) channel.

Three cases are possible:

- Intruder leaves call.

- Original conversation parties revert to normal two party call.
- Warning tone ceases.

- Third party leaves call.

- Intruder and called party remain in normal call.
- Warning tone ceases.

- Called party leaves call.

- Third party receives termination message.
- Called party is called by intruder as for normal internal call.
- Intruder hears ring control tone.

## Capacity

Anyone with a facility category (COS) that includes intrusion can undertake intrusion.

## Limitations

- Intrusion can only be effected on a party busy in a normal two party call.
- None of parties in ongoing call shall possess a category that prevents intrusion.
- Intruder must have facility category that includes intrusion.
- There shall exist free connection paths in conference circuit.

## Programming

0101 |  | Facility COS

3004 |  | Intrusion

0107 |  | Break-in allowed ?

These commands are only accessable via BMS/RASC:

1007 |  | Break-in allowed ?

2406 |  | Digit for executive intrusion

## Equipment

None

Revision: C © Ericsson Enterprise 2003