Gateway To Gateway Calls Via Isdn Cascading Link - Polycom RealPresence 1500 Administrator's Manual

● MCU to MCU
Cascading Between Two MCUs Using an ISDN Link
In this topology, an ISDN participant from conference running on MCU A calls a conference running
on MCU B over an ISDN link.
Guidelines
● Content is restricted. When another endpoint wants to send content, the first endpoint must stop
sending content before the second endpoint can initiate or send content.
● Endpoints that do not support H.239 can receive the Content using the Send Content to Legacy
Endpoints option.
● When a participant joins a conference with active Content, content cannot be viewed by the new
participant. Restart the Content.
● Cascaded MCUs/Gateways must be registered with the same Gatekeeper or neighboring
Gatekeepers. MCUs and endpoints must also be registered with Gatekeepers.
● Gateway/MCU calls require definition of IVR Services. For more information see
Service for Gateway
From version 7.1, the content sharing protocol is H.263 when sent over ISDN Cascading link.

Gateway to Gateway Calls via ISDN Cascading Link

When H.323 participants connects to another IP participants via a Gateway to Gateway call over an ISDN
link, the dialing string includes the following components:
[GW A prefix in GK] - The prefix with which the RealPresence Collaboration Server (gateway) is
registered to the gatekeeper.
[GW Profile ID] - The ID of the Gateway Profile defined on Gateway A to be used for routing the call to
the Gateway B.
[GW Profile ISDN/PSTN number] - The dial-in number assigned to the Gateway Profile defined on
Gateway B, including the required country and area codes.
Polycom®, Inc.
Calls.
Defining Cascading Conferences
Defining the IVR
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