A conference call allows three or more parties to have a conversation. The following features are available to establish a conference call:

Feature

Description

Details in

Conference

During a two-party conversation, an extension user can add other parties to establish a conference call with up to eight parties.

• 1.13.1.2 Conference

Executive Busy Override

An extension user can interrupt an existing call to establish a three-party conference call.

• 1.7.2 Executive Busy Override

Privacy Release

During a conversation with an outside party on the S-CO button, a proprietary telephone (PT) user can allow another extension to join the conversation.

• 1.13.1.3 Privacy Release

•	Up to 32 parties (including extension users and outside parties) can be engaged in different conference calls simultaneously. (4 eight-party conferences, 8 three-party conferences plus 2 four-party conferences, 10 three-party conferences, etc.)

This PBX supports conference calls consisting of up to eight parties. During a two-party conversation, an extension user can add other parties to their conversation, thereby establishing a conference. Conferences of more than four parties are only possible when a proprietary telephone (PT) user originates the conference.

Unattended Conference
The PT user who originated the conference can leave a conference to allow other parties to continue the conversation. The user may return to the conference, if he or she desires.

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Conference Button
For a PT which does not have the CONF (Conference) button, a flexible button can be customized as the Conference button.

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Unattended Conference Call Duration
The duration of an Unattended Conference can be restricted by the Unattended Conference Recall time. The Unattended Conference Recall time consists of the following programmable timers:

a)	Unattended Conference Recall Start Time: When the timer expires, Unattended Conference Recall starts to be heard at the conference originator. If the originator does not return to the conference, Unattended Conference Recall Continuous time before Sending Alarm Tone to CO will start.
b)	Unattended Conference Recall Continuous Time before Sending Alarm Tone to CO: When the timer expires, an alarm tone starts to be heard by parties in the Unattended Conference. If the originator does not return to the conference, Unattended Conference Recall & Alarm Continuous time before Disconnecting will start.
c)	Unattended Conference Recall & Alarm Continuous Time before Disconnecting: When the timer expires, the Unattended Conference call is disconnected.

If the originator returns to the conference before the Unattended Conference call is disconnected, the timer will be canceled. If not, Unattended Conference Recall and an alarm tone will continue to be heard until the Unattended Conference call is disconnected.

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For Conferences of Six or More Parties
An ECHO card is required, and Echocanceler should be enabled through system programming.

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

1.12.5 Consultation Hold).

Installation Manual

2.6.3 ECHO16 Card

User Manual

1.4.5 Multiple Party Conversation

By default, all conversations which take place on CO lines, extension lines and doorphone lines are protected from others interrupting the conversations (Automatic Privacy).
Privacy Release allows a proprietary telephone (PT) user to suspend Automatic Privacy for an existing CO line call on the S-CO button in order to establish a three-party call.
System programming is required to enable or disable this feature.

•	S-CO Button Any flexible button can be customized as the S-CO button.
•	Privacy Release Time Privacy is released for five seconds to allow the conversation to be joined.
•	This feature overrides Data Line Security ( 1.10.5 Data Line Security) and Executive Busy Override Deny ( 1.7.2 Executive Busy Override).