2.14.2 Conference
Description
An
extension user can establish a conference call by adding additional parties to an already existing two-party
conversation. This PBX supports three-party through eight-party conference calls. Conferences with more than
four parties are only possible when a PT or PS user originates the conference.
Unattended Conference:
The conference originator can leave the conference and allow other parties to continue. Establishing an
Unattended Conference allows the originator to return to the conference. Unattended Conferences can only
be established by PT and PS users.
Conditions
• When an extension is establishing a conference call the original party is put on hold.
• CONF (Conference) Button
For a PT/PS which does not have the CONF button, a flexible button can be customised as the Conference
button.
• Unattended Conference Call Duration
The length of time that a conference call can remain unattended is restricted by the following timers:
– Callback Start Timer
– Warning Tone Start Timer
– Disconnect Timer
These timers behave and operate according to the following chain of events:
1. When the unattended conference is established, the Callback Start Timer will begin.
2. When the Callback Start timer expires, the Unattended Conference originator’s extension will start to
receive a callback ringing from the PBX and the Warning Tone Start Timer begins.
3. When the Warning Tone Start Timer expires, the remaining parties of the conference will start to hear
a warning tone, the callback ringing will continue to be heard at the Unattended Conference
originator’s extension, and the Disconnect Timer begins.
4. When the disconnect Timer expires, the conference is disconnected.
If the Unattended Conference originator returns to the conference before the line is disconnected, all timers
are cleared.
• If the originator of a conference with two trunks leaves the conference, the call can become a trunk-to-trunk
call, if enabled through system programming.
– When a trunk-to-trunk call is established, the call will end when the Trunk-to-Trunk Call Duration timer
has elapsed (® 2.11.8 Trunk Call Limitation). The timer applied is that of the trunk group containing
the trunk being used for the call immediately preceding the conference. The timer cannot be extended.
– If both trunks are analogue trunks, the end of the trunk-to-trunk call may not be detected. For this
reason, if analogue trunks are used, it is not recommended to enable the establishment of trunk-to-trunk
calls after a conference call through system programming.
• When a KX-UT series SIP phone is used to originate a conference and one of the other parties leaves the
conference, the KX-UT series SIP phone user will still be able to talk to the remaining party but will not be
able to use the standard Hold feature.
PC Programming Manual References
10.3 PBX Configuration—[2-3] System—Timers & Counters—DISA / Door / Reminder / U. Conf
→
Unattended Conference—Recall Start Timer (x60s)
→ Unattended Conference—Warning Tone Start Timer (s)
→ Unattended Conference—Disconnect Timer (s)
10.7.1 PBX Configuration
—[2-7-1] System—Class of Service—COS Settings—CO & SMDR—
Transfer to
CO
200 Feature Guide
2.14.2 Conference
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