BusinessPhone Communication Platform 4.0
Facilities

## Refer Back

## Definition

The possibility to switch back and forth between two or more call partners for an unlimited number of times.

## Use

Enables an extension user to maintain contact with several call partners by switching simply from one to the other.

The call partners can be both internal and/or external.

## Operation

### System Telephones

Refer back is preceded by inquiry.

Refer back cannot be initiated until the inquiree (person to whom inquiry is made) answers.

The relevant lamps on the telephone of the extension who undertakes parking flash slowly for those keys on which calls are parked.

Refer back is executed by pressing the key for the desired call partner.

The parked party is connected and the previously connected party will automatically be parked individually.

The user can now choose to recaccess any of the parties that are parked on her/his telephone.

### Analogue telephones

Refer back is preceded by inquiry.

Refer back is not possible until the inquiree answers.

Refer back is initiated by pressing the R-button (on analogue telephones without R-button by dialling one pulse (digit) on the rotary dial).

The extension user receives dial tone and can now choose one of the following alternatives:

Digit 1 = |  | Reaccess parked party. Connected party is disconnected.

Digit 2 = |  | Refer back to parked party.

Digit 3 = |  | Three party call is initiated. Parked party is connected to call.

See also Conference (154/155 34-ASB 150 02 Uen).

If no digit is dialled within three seconds, dial tone will cease and refer back to the parked party ensues auto- matically.

The previously connected party will be parked automatically.

If digit 2 is dialled or if timeout takes place the refer-back procedure can be repeated an unlimited number of times provided the parked party does not go on hook.

## Capacity

The number of ongoing calls on System Telephones is limited only by the number of traffic function keys.

Analogue telephones can only switch between two call partners.

## Limitations

For refer back to be possible, an internal call must have been answered and the called party must remain on the line.

For external calls where no answer indication is obtained for outgoing calls “end of selection”, that is digit transmission, must have been completed.

## Programming

None

## Equipment

None

Revision: D © Ericsson Enterprise 2003