User's Manual 552 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
♦ Configure the device with an Inbound Manipulation rule that is applied to
calls received from the third-party network entity so that the device considers
conference calls as regular calls and forwards them to the Conference
server without getting involved in the conferencing setup.
To join a conference, the Request-URI includes the Conference ID string preceded by
the number of the participants in the conference and terminated by a unique number.
INVITE messages with the same URI join the same conference. For example:
INVITE sip:4conf1234@10.1.10.10
Note: Three-way conferencing using an external conference server is supported only
by FXS interfaces.
Local, On-board Conferencing: The conference is established on the device without
the need for an external Conferencing server. The device supports up to five
simultaneous, on-board, three-way conference calls. This feature supports local
mixing and transcoding of the three-way conferencing legs on the device and multiple
codec conference calls. You can configure the maximum number of simultaneous, on-
board conferences, using the MaxInBoardConferenceCalls parameter. Each on-board
three-way conference uses two DSP channels. As one channel is already provided by
the FXS port interface to which the calling party (initiator of the three-way conference)
is connected, the device obtains an additional DSP channel from another FXS port
interface that is idle. However, if your device is installed with an MPM module(s), it
obtains the DSP channel from the module. If the device is not installed with any MPM
modules and all FXS ports are busy, the three-way conference call cannot be made.
The mode is configured by setting the 3WayConferenceMode parameter to 2.
Note:
• If the device houses three MPMs or more, no other telephony interface module
can be installed in the device.
• Instead of using the flash-hook button to establish a three-way conference call,
you can dial a user-defined hook-flash code (e.g., "*1"), configured by the
HookFlashCode parameter.
• Three-way conferencing is applicable only to FXS and BRI interfaces.
• Three-way conferencing support for the BRI phones connected to the device
complies with ETS 300 185.
The following example demonstrates three-way conferencing using the device's local, on-
board conferencing feature. In the example, telephone "A" connected to the device
establishes a three-way conference call with two remote IP phones, "B" and "C":
1. A establishes a regular call with B.
2. A places B on hold, by pressing the telephone's flash-hook button and the number "1"
key.
3. A hears a dial tone and then makes a call to C.
4. C answers the call.
5. A establishes a three-way conference call with B and C, by pressing the flash-hook
button and the number "3" key.
To configure three-way conferencing:
1. Open the Supplementary Services Settings page (Setup menu > Signaling & Media
tab > Gateway folder > DTMF & Supplementary > Supplementary Services
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