Polycom SIP 3.0.2 사용자 설명서

Administrator’s Guide SoundPoint IP / SoundStation IP 

2 - 12

—Designed primarily for hands-free 

operation, reduces background noise to enhance communication in 

noisy environments.

—Designed to help provide a consistent noise level 

to the remote user of a hands-free call.

—Conforms to RFC 2833, which describes 

a standard RTP-compatible technique for conveying DTMF dialing 
and other telephony events over an RTP media stream.

—Generates dual tone multi-frequency 

(DTMF) tones in response to user dialing on the dial pad. 

—The phone will tag all Ethernet packets it transmits 

with an 802.1Q VLAN header.

—Allows for the setting of TOS settings.

—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.

—Designed to minimize 

latency for audio packet transmission.

—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.

—Generates various quality metrics 

including MOS and R-factor for listening and conversational quality.

• Security Features

—Several local settings 

menus are protected with two privilege levels, user and 
administrator, each with its own password.

—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.

—When trying to establish a connection to a boot 

server for application provisioning, the phone trusts certificates 
issued by widely recognized certificate authorities (CAs).

—Levels of security are provided for 

validating incoming network signaling.

For more information on each feature and its associated configuration 

parameters, see the appropriate section in 

 on page 

.