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DMA Operations Guide Introduction to the Polycom DMA System
2 Polycom, Inc.
The Polycom DMA system integrates with your Microsoft® Active
Directory®, automating the task of provisioning users for video conferencing.
Combined with its advanced resource management, this makes
reservationless video conferencing on a large scale feasible and efficient,
reducing or eliminating the need for conference scheduling.
The Polycom DMA system’s ability to handle multiple MCUs as a single
resource pool makes multipoint conferencing services highly scalable. You can
add MCUs on the fly without impacting end users and without requiring re-
provisioning.
The Conference Manager continually monitors the resources used and
available on each MCU and intelligently distributes conferences among them.
If an MCU fails, loses its connection to the system, or is taken out of service,
the Polycom DMA system distributes new conferences to the remaining
MCUs. The consequences for existing calls and conferences depend on
whether they’re H.323 or SIP:
• H.323 calls and conferences on the failed MCU are terminated. But callers
simply need to redial the same number they used for their initial dial-in.
Conference Manager relocates their new conference to the best available
MCU (provided there is still sufficient MCU capacity).
• SIP calls on the failed MCU are automatically moved to another MCU or
MCUs (if available), up to the capacity available.
Call Server
The Polycom DMA system’s Call Server provides the following functionality:
• H.323 gatekeeper
• SIP registrar and proxy server
• XMPP server (client-to-client connectivity, including chat and presence
information, for clients logged into the server)
• H.323 <—> SIP transition gateway
• Dial plan and prefix services
• Device authentication
• Bandwidth management
The Call Server can also be integrated with a Juniper Networks Service
Resource Controller (SRC) to provide bandwidth and QoS assurance services.
RealPresence Platform API
This version of the Polycom DMA system optionally allows an API client
application, developed by you or a third party, to access the RealPresence
Platform Application Programming Interface (API). This API access is licensed
separately. It provides programmatic access to the Polycom DMA system for
the following: