Polycom UC Software Administrators' Guide - 4.1.0

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Chapter 8: Setting Up Phone Audio Features After you set up your Polycom® phones on the network, phone users can send and receive calls using the default configuration. However, you might consider modifications that optimize the audio quality of your network. Frequency bandwidth is one of the most critical elements affecting the intelligibility of speech in telephony. The frequency range that the human ear is most sensitive to is far beyond the capabilities of the plain old telephony system (POTS). In fact 80 percent of the frequencies in which speech occurs are not even used by public telephone networks because they only operate from 300Hz to 3.5 kHz. Complicating the intelligibility of telephony speech in today’s world is background noise, variations in environmental reverberation, and communication among persons speaking a variety of native languages. While VoIP technology can broaden the frequency bandwidth and improve sound quality and intelligibility, it can also increase the network load and create a demand for lower raw bit rates. As Table 8-7: Audio Codec Specifications shows, Polycom offers phones with a range of codecs, including codecs with high frequency bandwidth and low raw bit rates. This chapter describes the audio sound quality features and options you can configure for your Polycom phones. Use these features and options to optimize the conditions of your organization’s phone network system. This chapter shows you how to update your configuration for the following audio-related features: Customizing Audio Sound Effects Enables you to customize sound effects associated with incoming calls and other events. Context Sensitive Volume Control Choose the volume levels for the various audio outputs on the phone. Voice Activity Detection Conserves network bandwidth by detecting periods of relative ‘silence’ in the transmit data path and replacing that silence with special packets that indicate silence is occurring. Generating Dual Tone Multi-Frequency (DTMF) Tones Generates dual tone multifrequency (DTMF) tones in response to user dialing on the dial pad. DTMF Event RTP Payload Conforms to RFC 2833, which describes a standard RTPcompatible technique for conveying DTMF dialing and other telephony events over an RTP media stream. Acoustic Echo Cancellation Employs advanced acoustic echo cancellation for handsfree operation. Audio Codecs Enables access to a wide range of industry standard audio codecs. 279
Polycom ® UC Software Administrators’ Guide 280 IP Type-of-Service Enables the setting packet priority. IEEE 802.1p/Q The phone may tag all Ethernet packets it transmits with an 802.1Q VLAN header. 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 Audible Ringer Location Choose how to play out audio tones. Notification Profiles Define how your handset alerts you to phone events like incoming calls, instant messages, and pages. This feature is only available on SpectraLink handsets. Bluetooth Headset Support Enable a Bluetooth headset for use with the SpectraLink phones. This chapter also outlines the following built-in audio processing features, which do not require any configuration changes to work: Automatic Gain Control Designed for handsfree operation, this feature boosts the transmit gain of the local user in certain circumstances. Background Noise Suppression Designed primarily for handsfree operation, this feature reduces background noise to enhance communication in noisy environments. Comfort Noise Fill Provides a consistent noise level to the remote user of a handsfree call. Dynamic Noise Reduction Provides maximum microphone sensitivity, while automatically reducing background noise. All Polycom phones automatically support this non-adjustable feature. This feature is also known as Noise Suppression. 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 outof-order, lost, or delayed packets. Low-Delay Audio Packet Transmission Minimizes latency for audio packet transmission. To troubleshoot any problems with your Polycom phones on the network, see Troubleshooting Your Polycom Phones. For more information on the configuration files, see Error! Reference source not found.. For more information on the Web Configuration Utility, see Error! Reference source not found.. For instructions on how to read the feature descriptions in this section, see Reading the Feature Parameter Tables. Customizing Audio Sound Effects You can customize the audio sound effects that are used for incoming calls and other alerts using synthesized tones or sampled audio files. You can replace the default sampled audio files with your own custom .wav audio file format. The phone supports the following .wav audio file formats: mono G.711 (13-bit dynamic range, 8-khz sample rate)
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ADMINISTRATORS’ GUIDE Polycom UC
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Contents About This Guide .........
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Contents Upgrading Polycom UC Softw
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Contents Configuring the Phone’s
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Contents Setting Up Microsoft Lync
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Contents Reading an Application Log
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Contents .........................
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Contents Third Party Call Control .
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Polycom ® UC Software Administrato
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Part I: Getting Started Part I give
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Chapter 2: The Polycom ® UC Softwa
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Figure 2-1: Polycom Wired Phones in
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Chapter 2: The Polycom ® UC Softwa
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What are the Resource Files? Chapte
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Chapter 3: Setting Up Your Device N
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Chapter 3: Setting Up CDP Compatib
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Parameter DHCP Option DHCP DHCP INF
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Chapter 3: Setting Up After you con
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Chapter 3: Setting Up Quick Setup
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You can update the network configur
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Name Possible Values EM Power Enabl
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DHCP Menu Tip: Changing the Default
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Name Possible Values Subnet Mask Do
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Name Possible Values VLAN Discovery
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Name Possible Values IP Address Dot
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WPA2-Enterprise Menu You can modify
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USBNet Menu Currently the USBNet me
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Name Possible Values Clear Custom D
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Name Possible Values Facility 0 to
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Part III: Configuring the Phone Fea
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Part IV: Troubleshooting and Mainta
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Part V: Polycom ® UC Software Refe
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POLYCOM, INC. APPLICATION PROGRAMMI
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LOSS) ARISING OUT OF THE USE OR INA
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