BusinessPhone Communication Platform 6.0
Facilities

## Automatic Callback – Trunk/Route

## Definition

An extension that, on a call to an individual trunk or route, encounters busy can order automatic callback.

When the order is made the system initiates supervision of both the caller and, the selected route or trunk.

When the relevant trunk or an optional trunk in the relevant route goes free the extension that ordered callback will be called back.

On activation of callback a new call will be initiated automatically on the selected trunk at the same time as the ordering extension is called.

## Use

External callback is a function that is utilised when one wishes to initiate an outgoing call but finds that all trunks are busy.

In the event of several orders, e.g. for the same route, the orders will be processed in the order in which they were received.

During the monitoring period the ordering extension user is free to use his telephone.

## Operation

#### To order

An extension who on initiation of a call encounters busy tone can order callback by keying digit 5 or other selected digit.

A user using DBC 223, DBC 213 or DBC 662 telephones can press the menu key call‑back to activate the function.

When the system has accepted the order the ordering extension hears verification tone or silence.

If the order is rejected, busy tone will continue.

#### Callback

When the trunk and ordering extension are free at the same time, the latter will be rung with a special ring signal at the same time as the selected trunk is seized to prevent incoming calls.

The call is presented on Line 1 or Line 2 as a normal internal call.

When the extension user answers he or she hears internal dial tone and the display goes blank.

The extension can now dial the route number followed by the number of the relevant public network subscriber.

If the extension fails to answer the callback within 8 seconds, the supervised trunk will be released at the same time as the ring signals cease.

## Capacity

A maximum of 25 callback monitoring tasks can be stored in the system concurrently.

## Limitations

- Each extension can only set up one monitoring task to a trunk or route. However an extension can set up several internal monitoring tasks that run concurrently with the external one.
- If the ordering extension activates "follow me" or "diversion" during the monitoring will not be affect.
- Callback is activated when both ordering extension and trunk are free at the same time.
- If the monitored parties are not free at the same time during a 30-minutes period, monitoring will be terminated.

## Programming

Following commands are only accessable via BMS.

2008 |  | Verification tone on call back

2402 |  | Digit for Call back

1006 |  | Call back allowed ?

3302 |  | Callback allowed ?

## Equipment

None.

Revision: C © Ericsson Enterprise 2004