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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 607
● 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.
● Up to 80 gateway calls may be run on a fully configured MCU.
● Gateway Profiles are included in the Backup and Restore Configuration operations.
● CDR files are generated for Gateway Sessions in the same way as for conferences.
● Cascading. To support cascading, the gateway indicates a lower number than the MCU for
master-slave relation (directly or through DMA).
● Gateway calls are supported in Microsoft and Avaya environments.
● If the ENABLE_AUTO_EXTENSION system flag is set to:
YES (default), Gateway Calls are not limited in duration while endpoints are connected.
NO, Gateway Calls are limited to 60 minutes.
For more information see Modifying System Flags.
Call Flows
Call flow changes according to the connection protocols: IP or ISDN. This section describes the call flows
between two endpoints connect via one gateway. For call flows describing connections between two
endpoints via two gateways, or a connection of an endpoint to a conference running on MCU via a gateway,
see Basic Cascading using ISDN Cascaded Link.
IP Participants
The following calling methods are available:
● Direct Dialing - the dialing string includes the destination number/conference ID and the call is routed
directly to the destination endpoint/conference. This is the recommended method.
● Gateway IVR Dialing For IP Participants - the call connects to the gateway, where through interaction
with the IVR, the destination number is entered using DTMF codes.
● Direct Dialing Using IP Addresses - dial and receive calls to and from H.323 endpoints using the IP
address when that the Gatekeeper is not functioning
● Calling a SIP Endpoint in a Remote Domain - connection of H.323 and SIP endpoints residing in one
domain to SIP endpoints residing in a remote domain
Direct Dialing
The calling endpoint enters the dialing string that includes the access numbers to the Collaboration Server
Gateway Profile and the number of the destination endpoint. Up to 10 destination numbers can be entered
in one string.
The call connects to the Collaboration Server Gateway Profile and a Gateway Session is created. The
dial-in participant is automatically connected to it.
During the connection phase, the number being dialed is displayed on the screen of the calling endpoint.