An extension user can establish a conference call. The following Conference features are available:

Feature

Description

3-party Conference

During a 2-party conversation, an extension user can add a third party to the conversation, thereby establishing a 3-party conference call.
Unattended Conference:
The proprietary telephone (PT) user who originated a conference with 2 outside parties can leave the conference and allow the other parties to continue the conversation. The user may return to the conference at any time, if he or she desires.

5-party Conference

A PT user can establish a 3-party to 5-party conference call by entering the 5-party Conference feature number.

[General]

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Conference call arrangement
The following configurations of 3-party or 5-party conference calls are possible at the same time through system programming (

Conference Pattern [116]):

–	3-party conference calls between 3 extensions: Up to 3
–	3-party conference calls between one extension and 2 outside parties: Up to 4
–	3-party conference calls between 2 extensions and one outside party: Up to 4
–	5-party conference call with up to 5 extensions or with a combination of extensions and up to 2 outside parties: One

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Conference Button
On a PT that does not have a CONF (Conference) button, a flexible CO button can be customised as a Conference button.

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Consultation Hold
When an extension user tries to establish a conference call, the current call is automatically placed on consultation hold until the conference is established (

1.12.5 Consultation Hold).

[3-party Conference]
•	A confirmation tone will be sent to all parties when a 2-party conference call is changed to a 3-party conference call. It is possible to eliminate the tone through system programming ( Conference Tone [105]).
•	Unattended Conference Recall The duration of unattended conferences is restricted by a system timer ( CO-to-CO Line Call Duration [205]). A ring tone or an alarm tone is heard at the conference originator's extension 50 seconds before the timer expires. A warning tone starts to be heard by parties in the unattended conference 15 seconds before the timer expires. If the originator returns to the conference before the unattended conference call is disconnected, the timer will be cancelled. If not, the ring tone or alarm tone and the warning tone will continue to be heard until the unattended conference call is disconnected ( 1.10.8 Outside (CO) Line Call Limitation).
•	An unattended conference cannot be established unless the extension is allowed to transfer a call to an outside party through system programming ( Call Transfer to CO Line [606]).

[5-party Conference]

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The following features will not function during a 5-party conference call:

–	Call Hold
–	Call Park
–	Call Splitting
–	Call Transfer
–	Executive Busy Override
–	Unattended Conference

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A confirmation tone will be sent to all parties when a 5-party conference call is established and when a 5-party conference call is changed to a 4-party conference call or vice versa. It is possible to eliminate the tone through system programming (

Conference Tone [105]).