Mitel 6800 Series Administrator's Manual page 581

When an IP phone user is connected to multiple conference calls, some outbound proxies have
maximum call "hold" time set from 30-90 seconds. After this time, the call that is on hold is
disconnected.
• Disconnect from an active conference call while allowing the other callers to remain
connected.
• Ability to create N-way conference.
• Join two active calls together into a conference call.
• Incoming or outgoing active call can join any of the existing conferences.
If the administrator does not configure centralized conferencing, then the IP phone uses
localized conferencing by default.
Note: When you configure centralized conferencing globally for an IP Phone, the global
settings apply to all lines. Although, for the global setting to work on soft lines, the user
must configure the lines with the applicable phone number.
An Administrator can configure centralized conferencing on a global or per-line basis using the
configuration files or the Mitel Web UI.
To use the centralized conferencing after it is enabled, see your <Model-Specific> SIP Phone
User Guide.
CONFIGURING CENTRALIZED CONFERENCING USING THE CONFIGU-
RATION FILES
You use the following parameters to configure centralized conferencing in the configuration files:
Global Parameter
• sip centralized conf
Per-Line Parameter
• sip lineN centralized conf
CONFIGURATION FILES
For specific parameters you can set in the configuration files, see Appendix A, the section,
"Centralized Conferencing Settings"
on .
page A-93
Operational Features
5-318