Weed Eater 2600 manual Configuring Voice Activity Detection VAD, Fine-Tuning Analog Voice Ports

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Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

Configuring Voice Activity Detection (VAD)

Voice activity detection (VAD) is configured on dial peers; by default it is enabled. For more information, see the “Configuring Dial Plans, Dial Peers, and Digit Manipulation” chapter in the Cisco IOS Release 12.2 Voice, Video, and Fax Configuration Guide, Release 12.2. Two parameters associated with VAD, music threshold and comfort noise, are configured on voice ports.

If VAD is enabled, use the following commands to adjust parameter values associated with VAD, beginning in voice-port configuration mode:

 

Command

Purpose

Step 1

 

 

Router(config-voiceport)# music-thresholdnumber

Specifies the minimal decibel level of music played

 

 

when calls are put on hold. The decibel level affects

 

 

how voice activity detection (VAD) treats the music

 

 

data. Valid entries range from –70 to –30. When

 

 

used with VAD, if the level is set too high, the

 

 

remote end hears no music; if it is set too low, there

 

 

is unnecessary voice traffic. The default is –38.

Step 2

 

 

Router(config-voiceport)# comfort-noise

This parameter creates subtle background noise to

 

 

fill silent gaps during calls when VAD is enabled on

 

 

voice dial peers. If comfort noise is not generated,

 

 

the resulting silence can fool the caller into

 

 

thinking the call is disconnected instead of being

 

 

merely idle. The default is that comfort noise is

 

 

enabled.

 

 

 

Fine-Tuning Analog Voice Ports

Normally, default parameter values for voice ports are sufficient for most networks. Depending on the specifics of your particular network, however, you may need to adjust certain parameters that are configured on voice ports. Collectively, these commands are referred to as voice-port tuning commands.

Note The commands, keywords, and arguments that you are able to use may differ slightly from those presented here, based on your platform, Cisco IOS release, and configuration. When in doubt, use Cisco IOS command help (command ?) to determine the syntax choices that are available.

The voice-port tuning commands are grouped into these categories and explained in the following sections:

•Configuring Disconnect Supervision Commands (optional)

•Configuring FXO Supervisory Disconnect Tone Commands (optional)

•Configuring Timeouts Commands (optional)

•Timing Commands (optional)

•Voice Quality Tuning Commands (optional)

Full descriptions of the commands in this section can be found in the Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2.

Cisco IOS Release 12.2(2)XT and 12.2(8)T

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Contents Cisco High-Density Analog Voice and Fax Network Module Feature History Release ModificationBase Module Feature OverviewVoice Port Numbers InterfaceFXS and FXO Interfaces Telephony Signaling InterfacesDisconnect Supervision Commands Delay in Voice Networks FXO Supervisory Disconnect Tone CommandsEcho Cancellation Voice Level AdjustmentAdaptive Jitter Buffering Serviceability Voice Activity Detection CommandsBenefits Cost EffectiveSupported High-Complexity Codecs RestrictionsSupported Medium-Complexity Codecs Supported low-Complexity CodecsRelated Documents Supported PlatformsCisco 2600 series Prerequisites Supported Standards, MIBs, and RFCsConfiguring Analog FXO and FXS Voice Ports Configuration TasksCommand Purpose FXO or FXSDefault is Keyword default is 25 on Cisco 2600 seriesDefault is the pattern specified by the cptone Locale that has been configuredFine-Tuning Analog Voice Ports Configuring Voice Activity Detection VADConfiguring Disconnect Supervision Commands Reversal is enabled Enables battery reversal. The default is that batteryFor FXO ports-Use the no battery-reversal Command to configure a loop-start voice port to notConfiguring FXO Supervisory Disconnect Tone Commands Sec. The default is From 0 to 1000 0 ms to 10 sec. The default isExits voice class configuration mode Voice network module is installedConfiguring Timeouts Commands Timing Commands Configuring Adaptive Jitter Adjustment Voice Quality Tuning CommandsConfiguring Voice Level Adjustment Configuring Echo AdjustmentPlatform Command Syntax Verifying Analog Voice-Port ConfigurationsTroubleshooting Chart, Voice Port Testing Commands, Troubleshooting TipsProblem Suggested Action Troubleshooting ChartReconfigure the voice port Keyword setting also called region tone is USConfiguring Voice Level Adjustment section on Voice Port Testing CommandsLoopback Function Tests Detector-Related Function TestsRelay-Related Function Tests Tone Injection TestsKeyword fax to force the voice port into fax mode Fax/Voice Mode TestsTest. Enter the keyword disable to return Voice port to voice modeAnalog FXO Voice Port Example Configuration ExamplesAnalog FXS Voice Port Example Debug dspapi, Debug hpi, Command ReferenceDebug dspapi Defaults Command Modes Command HistorySyntax Description Release ModificationRelated Commands Description Command Modes Command History DefaultsDebug hpi Usage Guidelines ExamplesTo global configuration mode Global configurationVoice-port Cisco 2600, and Cisco 3600 RouterEncapsulation Dial-peer voiceGlossary
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