Polycom, Inc. 19-1
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Gateway Calls

The RealPresence Collaboration Server (RMX) can be used as a gateway that provides
connectivity across different physical networks and translates multiple protocols for point-
to-point rich media communications.
The RMX supports the widest range of video and audio algorithms. It allows sites with
different frame rates, connection speeds, audio algorithms, video resolutions and network
protocols to transparently connect with one another. It also enables multipoint conference
creation from an endpoint.
A special conference acting as a Gateway Session is created on the RMX. It includes one dial-
in connection of the endpoint initiating the Gateway Session and one or several dial-out
connections to endpoints. It provides connectivity between the various protocols: H.323,
SIP, ISDN and PSTN.
To enable the gateway functionality a special Gateway Profile is defined on the RMX.

Gateway Functionality

The following features and capabilities are supported in gateway calls:
•Gateway Sessions are in CP mode only.
If Video Switching is selected in the Profile assigned to the Gateway Session, the system
ignores this setting and will run the Gateway Session in CP mode.
—From Version 7.2, Gathering phase is not supported in gateway calls, even if it is
defined in the Profile assigned to the Gateway Profile.
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• FECC - IP participants only as FECC is not supported by the ISDN protocol.
• Recording. The Recording Link is not considered as a participant and therefore, the
gateway session will automatically end when only one of the participants remains
connected in addition to the recording link. The video of the Recording Link is not
included in the display of the video of the gateway call.
• Forwarding of DTMF codes from the Gateway Session to a conference running on
another gateway, MCU or DMA. This enables the participant to enter the required
conference and/or chairperson password when connecting to another conference.
DTMF forwarding is enabled when there are only two participants connected to the
Gateway Session.
• Forwarding of all DTMF codes sent by participants in the Gateway Session to all PSTN
and ISDN participants. This is enabled by adding the
ALWAYS_FORWARD_DTMF_IN_GW_SESSION_TO_ISDN System Flag to
system.cfg and setting its value to YES.
Gateway calls are supported in AVC Conferencing Mode only.