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Polycom
®
RealPresence DMA
®
7000 System Overview
Polycom, Inc. 14
multipoint video conferencing. Combined with its advanced resource management, this makes
reservationless (ad hoc) video conferencing on a large scale feasible and efficient, reducing or eliminating
the need for conference scheduling.
The Polycom RealPresence 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 RealPresence DMA system can span a conference across two
or more MCUs (called cascading), enabling the conference to contain more participants than any single
MCU can accommodate.
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 RealPresence DMA system distributes new conferences to the remaining
MCUs. Every conference on the failed MCU is restarted on another MCU (provided there is space
available). The consequences for existing calls in those conferences depend on whether they’re H.323 or
SIP:
● H.323 participants are not automatically reconnected to the conference. In order to rejoin the
conference, dial-in participants simply need to redial the same number they used for their initial
dial-in. Dial-out participants will need to be dialed out to again; the RealPresence DMA system
doesn’t automatically redial out to them.
● SIP participants are automatically reconnected to the conference on the new MCU. This includes
both dial-in and dial-out SIP participants. No new dial-out is needed because the RealPresence DMA
system maintains the SIP call leg to the participant and only has to re-establish the SIP call leg from
the RealPresence DMA system to the MCU.
Call Server
The Polycom RealPresence DMA system’s Call Server provides the following functionality:
● H.323 gatekeeper
● SIP registrar and proxy 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
The Polycom RealPresence DMA system optionally allows an API client application, developed by you or a
third party, to access the Polycom RealPresence
®
Platform Application Programming Interface (API). This
API access is licensed separately. It provides programmatic access to the Polycom RealPresence DMA
system for the following:
● Provisioning
● Conference control and monitoring
● Call control and dial-out
● Billing and usage data retrieval
● Resource availability queries