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Call Server Settings

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.

The RealPresence DMA system’s gateway function is used only for calls to registered endpoints, SIP peers, and H.323 gatekeepers. It is not used for calls to virtual meeting rooms (VMRs), virtual entry queues (VEQs), external IP addresses.

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 is not in the media path, its gateway function does not support DTMF transmission.

The gateway function also does not support content sharing or AES encryption.

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