BusinessPhone Communication Platform 5.1
Facilities

## Italy – ISDN three party conference

## Definition

The feature gives the possibility to an ASB 15002 user to establish a market-specific ISDN feature call hold, inquiry and conference during an ongoing external call.

Two external call setups are handled with two different call referencies ( two D-channels in use) even though only one trunk individual is used (one B-channel in use).

## Use

The primary purpose of this functionality is to provide control of an external conversation recorder, as one of the external conference members (C-party). The A- and B-party conversation can thereby be recorded.

## Operation

ASB 150 02 is connected to the public ISDN via a T-reference point as a stand-alone PBX.

#### The feature title ’three-party conference’ covers two separate functional parts

1. Call hold (external inquiry)
   The feature gives the possibility during an ongoing external call to hold the external B-party, make an inquiry call to an other external C-party, retrieve, alter or separately release one of the connected parties.
2. Three party conference (external conference)
   The feature gives the possibility during the ongoing external inquiry to initiate a conference with external B-and C-party.

At user side the feature activation procedures are
ASB 15002 system specific.

At network side the feature handling is only applicable by using the market specific (Italian) network procedures.

The call handling and feature procedures to the network side are handled with two different Call References for the B- and C-party connections but they use the same B-channel.

### User procedure

For an ASB15002 user (A-party) in the feature procedures in external speech with function keys are as follows:

#### Call hold activation/retrive

A-party in an external speech state starts the external call-hold procedure of B-party by pressing the function key ’external inquiry key’ (’ext. R-key’).

A retrieve back to normal speech state with B-party is possible by pressing the same function key again (toggle function of the key).

#### Inquiry activation/alternation/retrieve

Otherwise the 1st dialled digit is an indication for the system that the external inquiry call to the C-party destination has started. The digits for the inquiry call are dialled without any external access code.

In the external inquiry state either the external B- or C-party is actively connected to the A-party. The alternation procedures between the external parties is done by toggle with the ’external inquiry key’.

From the inquiry call state a retrieve back to the normal speech state is possible by clearing the call to the actively connected party and the remaining party will be retrieved from hold.

#### Conference activation/retrieve

A-party initiates an external conference with function key ’conference’.

From conference state a retrieve back to the inquiry call state is possible by pressing the function key ’external inquiry key’. This generates a ’call hold’ and ’retrieve from hold’ of the respective party in the network.

If one of the external parties releases during conference a normal speech state is retrieved with the remaining party.

A-party can release the conference call with ordinary call release procedures, by pressing the ’clear’ key or hooking on. In this case both external parties are released, the line key indicates ’free’ and the instrument display ’idle’.

#### Facility code digit sending

During the external inquiry- (and conference-) state the possible dialled facility code digits are sent as ordinary end-to-end DTMF digits. In the present case for control of the external conversation recorder.

## Capacity / Limitations

This feature is only accessable on telephones with function keys (Digital system telephones).

Note

the used term ’function keys’ can designate one of the following service activation keys, depending of the terminal type & operation key:
- programmable function key
- predefined key
- menu key

The two call setups A-party- B-party and A-party-C-party are handled as two separate call connections. Thereby the internal call logging (CIL) will generate two separate call logs for these two call setups.

The call metering registration (CM) separates also the two call setups during external inquiry and conference.

The feature is FECU-protected with a general protection level, ’basic R12’.

This feature is available only for the initiating user. Thus the call cannot be processed to other ASB15002 users during feature activation (e.g. call transfer, common call pick-up).

## Programming

1911 |  | Network signalling protocol

1973 |  | ISDN Stimulus services

Combine the Italian network protocol with stimulus service “Call Hold and 3 Party Conference”.

## Equipment

- At least FECU Index 1 for Release ASB 150 02 R12 or higher
- ISDN firmware BA/PRA on BTU-D or BTU-B_ or MFU.

Revision: C © Ericsson Enterprise 2003