Polycom SIP 3.1 manual Administrator’s Guide SoundPoint IP / SoundStation IP

Administrator’s Guide SoundPoint IP / SoundStation IP

—Automatic Gain Control—Designed for hands-free operation, boosts the transmit gain of the local user in certain circumstances.

—Background Noise Suppression—Designed primarily for hands-free operation, reduces background noise to enhance communication in noisy environments.

—Comfort Noise Fill—Designed to help provide a consistent noise level to the remote user of a hands-free call.

—DTMF Event RTP Payload—Conforms to RFC 2833, which describes a standard RTP-compatible technique for conveying DTMF dialing and other telephony events over an RTP media stream.

—DTMF Tone Generation—Generates dual tone multi-frequency (DTMF) tones in response to user dialing on the dial pad.

—IEEE 802.1p/Q—The phone will tag all Ethernet packets it transmits with an 802.1Q VLAN header.

—IP Type-of-Service—Allows for the setting of TOS settings.

—Jitter Buffer and Packet Error Concealment—Employs a high-performance jitter buffer and packet error concealment system designed to mitigate packet inter-arrival jitter and out-of-order or lost (lost or excessively delayed by the network) packets.

—Low-Delay Audio Packet Transmission—Designed to minimize latency for audio packet transmission.

—Voice Activity Detection—Conserves network bandwidth by detecting periods of relative “silence” in the transmit data path and replacing that silence efficiently with special packets that indicate silence is occurring.

—Voice Quality Monitoring—Generates various quality metrics including MOS and R-factor for listening and conversational quality. This feature is part of the Productivity Suite.

•Security Features

—Local User and Administrator Privilege Levels—Several local settings menus are protected with two privilege levels, user and administrator, each with its own password.

—Configuration File Encryption—Confidential information stored in configuration files must be protected (encrypted). The phone can recognize encrypted files, which it downloads from the boot server and it can encrypt files before uploading them to the boot server.

—Custom Certificates—When trying to establish a connection to a boot server for application provisioning, the phone trusts certificates issued by widely recognized certificate authorities (CAs).

—Incoming Signaling Validation—Levels of security are provided for validating incoming network signaling.

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