Polycom 7000 User Manual

Polycom, Inc. 

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This section describes the Polycom

®

 RealPresence

® 

Distributed Media Application™ (DMA

®

) 7000 

system’s configuration tools and tasks related to its Call Server: 

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These are settings and features that are shared across superclustered systems. See 

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The Polycom RealPresence DMA system’s Call Server capabilities provide gatekeeper functionality (if 
H.323 signaling is enabled), SIP proxy server and registrar functionality (if SIP signaling is enabled), and 
bandwidth management. 

The system can also function as an H.323 <-> SIP gateway. 

In addition, the system can be integrated with a Juniper Networks Service Resource Controller (SRC) to 
provide bandwidth assurance services. 

Note: Call server characteristics
In H.323, DTMF tones are usually sent over the H.323 signaling path. In SIP, DTMF tones are usually 
sent over the media path as a special RTP payload packet (see RFC 4733). Because of this difference 
and because the RealPresence DMA system isn’t in the media path, its gateway function doesn’t 
support DTMF transmission. 
The gateway function also doesn’t support content sharing or AES encryption. 
The RealPresence DMA system’s gateway function is used only for calls to registered endpoints, SIP 
peers, and H.323 gatekeepers. It’s not used for calls to virtual meeting rooms (VMRs), virtual entry 
queues (VEQs), external addresses, or IP addresses.