Polycom IP 320 Administrator's Manual page 32

Administrator's Guide for the SoundPoint IP / SoundStation IP / VVX Family
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— Presence—Allows the phone to monitor the status of other
users/devices and allows other users to monitor it. Requires call
server support.
— Real-Time Transport Protocol
transport protocol (RTP) streams as bi-directional from a control
perspective and expects that both RTP end points will negotiate the
respective destination IP addresses and ports.
— Recording and Playback of Audio Calls
allows the user to record any active conversation using the phone on
a USB device. The files are date and time stamped for easy archiving
and can be played back on the phone or on any computer with a media
playback program that supports the .wav format. This feature is part
of the Productivity Suite.
— Server Redundancy—Server redundancy is often required in VoIP
deployments to ensure continuity of phone service for events where
the call server needs to be taken offline for maintenance, the server
fails, or the connection from the phone to the server fails.
— Shared Call Appearances—Calls and lines on multiple phones can be
logically related to each other. Requires call server support.
— Static DNS Cache—Set up a static DNS cache and provide for negative
caching.
— Synthesized Call Progress
and efficient audible call progress feedback generated by the PSTN
and traditional PBX equipment, call progress tones are synthesized
during the life cycle of a call. Customizable for certain regions, for
example, Europe has different tones from North America.
— Voice Mail Integration—Compatible with voice mail servers.
• Audio Features
— Acoustic Echo
cancellation for hands-free operation.
— Audio Codecs—Supports a wide range of industry standard audio
codecs.
— Automatic Gain
the transmit gain of the local user in certain circumstances.
— Background Noise
operation, reduces background noise to enhance communication in
noisy environments.
— Comfort Noise
to the remote user of a hands-free call.
— DTMF Event RTP
a standard RTP-compatible technique for conveying DTMF dialing
and other telephony events over an RTP media stream.
Ports—The phone treats all real- time
Tones—In order to emulate the familiar
Cancellation—Employs advanced acoustic echo
Control—Designed for hands-free operation, boosts
Suppression—Designed primarily for hands-free
Fill—Designed to help provide a consistent noise level
Payload—Conforms to RFC 2833, which describes
— Recording and playback