Cisco Systems 7960G, 7940G manual Metric Change Condition

Page 124

Chapter 8 Troubleshooting and Maintenance

Monitoring the Voice Quality of Calls

To use the metrics for monitoring voice quality, note the typical scores under normal conditions of zero packet loss, and use the metrics as a baseline for comparison.

It is important to distinguish significant changes from random changes in metrics. Significant changes are scores that change about 0.2 MOS or greater and persist in calls that last longer than 30 seconds. Conceal Ratio changes should indicate greater than 3 percent frame loss.

MOS LQK scores can vary based on the codec that the Cisco Unified IP Phone uses. The following codecs provide these maximum MOS LQK scores under normal conditions with zero frame loss:

•G.711 codec gives 4.5 score

•G.719A/ AB gives 3.7 score

A Conceal Ratio of zero indicates that the IP network is delivering frames and packets on time with no loss.

When you observe significant and persistent changes to metrics, use Table 8-5for general troubleshooting information:

Table 8-5

Changes to Voice Quality Metrics

 

 

 

Metric Change

 

Condition

 

 

MOS LQK scores

Network impairment from packet loss or high jitter:

decrease significantly

•

Average MOS LQK decreases could indicate widespread and uniform impairment.

 

 

 

 

• Individual MOS LQK decreases indicate bursty impairment.

 

 

Cross-check with Conceal Ratio and Conceal Seconds for evidence of packet loss and jitter.

 

 

 

MOS LQK scores

•

Check to see if the phone is using a different codec than expected (RxType and TxType).

decrease significantly

•

Check to see if the MOS LQK version changed after a firmware upgrade.

 

 

 

 

 

Conceal Ratio and

•

Network impairment from packet loss or high jitter.

Conceal Seconds

 

 

increase significantly

 

 

 

 

 

Conceal Ratio is near or

•

Noise or distortion in the audio channel such as echo or audio levels.

at zero, but the voice

•

Tandem calls that undergo multiple encode/decode such as calls to a mobile network or

quality is poor

 

 

 

calling card network.

 

 

 

 

 

• Acoustic problems coming from a speakerphone, handsfree mobile phone or wireless headset.

 

 

Check packet transmit (TxCnt) and packet receive (RxCnt) counters to verify that voice packets

 

 

are flowing.

 

 

 

 

Voice quality metrics do not account for noise or distortion, only frame loss.

 

Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)

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OL-15498-01

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Contents Americas Headquarters Text Part Number OL-15498-01Copyright 2008 Cisco Systems, Inc. All rights reserved N T E N T S Network Requirements Configuring Security on the Cisco Unified IP Phone ViiPort 1 Network, Port 2 Access, and Port 3 Phone Statistics ViiiCable Specifications E-2 D E Overview AudienceOrganization XiiiCisco Unified Communications Manager Administration Related DocumentationChapter Description Cisco Unified IP Phone 7960G/7940G SeriesDocument Conventions Cisco Product Security OverviewCisco Unified Communications Manager Business Edition Convention DescriptionXvi An Overview of the Cisco Unified IP Phone Cisco Unified IP Phone 7960G An Overview of the Cisco Unified IP Phone What Networking Protocols Are Used? Networking Protocol Purpose Usage NotesRefer Cisco Unified Communications Manager System GuideUDP Related TopicsConfiguring Telephony Features Feature OverviewRelated Topic Understanding Security Features for Cisco Unified IP Phones Providing Users with Feature InformationTopic Reference Refer to Cisco Unified Communications Manager SecurityGuide Refer to Cisco Unified Communications ManagerOverview of Supported Security Features Feature DescriptionCommunications Manager Security Guide Phone section on page 3-10for more informationUnderstanding Security Profiles Identifying Encrypted and Authenticated Phone Calls Security RestrictionsCapf Interaction when the Phone Resets ExampleOL-15498-01 Purpose For More Information Administration Guide, Directory NumberRefer to the Cisco Unified Communications Manager Administration Guide, Softkey Template Administration GuideTask Purpose For More Information URLInstalling Cisco Unified IP Phones Settings Network Configuration Refer to Cisco Unified IP Phone 7960G/7940GSeries Phone Guide for Cisco Unified Communications Manager 7.0 SccpOL-15498-01 A P T E R Related Topic Providing Power to the Cisco Unified IP Phone Power Guidelines Power OutageObtaining Additional Information about Power Power Type GuidelinesUnderstanding Phone Configuration Files URLDescription Related Topics Understanding the Phone Startup ProcessUnified Communications Manager Security Guide Request the configuration file Requires MAC Method Address? Adding Phones with Auto-RegistrationTaps Adding Phones with Auto-Registration and Taps Unified Communications Manager System GuideUsing Cisco Unified IP Phones with Different Protocols ProcedureAdding Phones with BAT Converting a New Phone from Sccp to SIPConverting an In-Use Phone from SIP to Sccp Converting an In-Use Phone from Sccp to SIPDeploying a Phone in an Sccp and SIP Environment Determining the MAC Address for a Cisco Unified IP Phone ParametersSetting Up the Cisco Unified IP Phone Before You BeginNetwork and Access Ports, Handset, Speakerphone, Headset, Cisco Unified Communications Manager ConfigurationNetwork Requirements Network and Access Ports HandsetSpeakerphone HeadsetAudio Quality Subjective to the User Procedure Reference Installing the Cisco Unified IP PhoneBefore You Begin Cisco Unified IP Phones 7960G and 7940G Cable Connections Attaching the Cisco Unified IP Phone Expansion Module Expansion ModuleAdjusting the Placement of the Cisco Unified IP Phone Adjusting Cisco Unified IP Phone Footstand and Phone HeightConfiguring Softkey Templates, Mounting the Phone to the WallVerifying the Phone Startup Process Parts Used in Wall Mounting the Cisco Unified IP PhoneConfiguring Startup Network Settings Configuring Security on the Cisco Unified IP PhoneFrom the phone, choose Settings Security Configuration OL-15498-01 Configuring Network Settings on the Cisco Unified IP Phone Displaying the Network Configuration MenuUnlocking and Locking Options Overview of Network Configuration Options Network ConfigurationEditing Values Category Description Menu OptionPC Vlan Network Configuration MenuOption Description To Change Configuration Menu section on Communications Manager Security Guide. For informationSystem Device Pool Communications Manager Options section onManager, choose System Enterprise Choose System Enterprise Parameters ConfigurationManager, choose Device Phone Phone Including language, font, date and time formatting, Disabling the phone’s ability to accept Gratuitous ARP will State Cisco Unified Communications Manager OptionsBlank Communications Manager Administration Guide Designation DescriptionDevice Pool To Cisco Unified Communications Manager Security GuideOL-15498-01 Configuring Features, Templates, Services, and Users Feature Description Configuration Reference Administration Guide, Cisco Unified IPCommunications Manager Features and Services Cisco Unified Communications ManagerFeatures and Services Guide, Barge Features and Services Guide, Call DisplayAdministration Guide, Configuring Specifying Options that Appear on the UserAdministration Guide, Configuring Cisco Unified Communications Manager FeaturesCommunications Manager System Guide, Call Communications Manager System GuideDND Unified Communications ManagerFeatures and Services Guide, Malicious Administration Guide, Message WaitingMcid MlppServices menu on a phone Administration Guide, Time Period Manager Administration GuideAdministration Guide, Conference Bridge Cisco VT Advantage Administration GuideConfiguring Corporate and Personal Directories Configuring Corporate DirectoriesConfiguring Personal Directory Creating Custom Phone RingsModifying Phone Button Templates SynchronizerConfiguring Softkey Templates Setting Up ServicesAdding Users to Cisco Unified Communications Manager Giving Users Access to the User Options Web PagesManaging the User Options Web Pages Procedure OL-15498-01 A P T E R Model Information Screen Status MenuSelect Status Messages Status Messages ScreenMessage Description Possible Explanation and Action Communications Manager Administration Network Configuration Menu section onAddress. See the Network Configuration Menu Adding Phones with Cisco UnifiedConfiguration Menu section on page 4-4section for Configuration Menu section on page 4-4for See the Firmware Versions Screen section onSelect Network Statistics Network Statistics ScreenMessage Component Description Firmware Versions Screen Select Firmware Versions Expansion Module Stats ScreenSelect Expansion Module Stats Call Statistics Screen Select Call StatisticsMOS LQK Voice Quality MetricsMonitoring the Voice Quality of Calls section on Security Configuration Menu CTL File MenuCertificate Icon Trust List Menu Monitoring the Cisco Unified IP Phone Remotely Accessing the Web Page for a Phone Http//IPaddressDevice Information Disabling and Enabling Web Page AccessChoose Device Phone Network Configuration Vlan ID Description Network Statistics Ethernet StatisticsPort 1 Network, Port 2 Access, and Port 3 Phone Statistics Description Device Logs Stack Statistics Streaming StatisticsStatus Messages Streaming Statistics Area Items Description OL-15498-01 Troubleshooting and Maintenance Resolving Startup ProblemsTroubleshooting and Maintenance Resolving Startup Problems Identifying Error Messages Verifying IP Addressing and Routing Creating a New Configuration File Choose Tools Control Center Feature ServicesSymptom Cisco Unified IP Phone Unable to Obtain IP Address Cisco Unified IP Phone Resets UnexpectedlyVerifying Physical Connection Verifying Dhcp Settings Checking Static IP Address SettingsVerifying Voice Vlan Configuration Identifying Intermittent Network OutagesVerifying that the Phones Have Not Been Intentionally Reset Eliminating DNS or Other Connectivity ErrorsTroubleshooting Cisco Unified IP Phone Security Problem Possible CauseSummary Explanation General Troubleshooting TipsOptions section on page 4-2for details Summary Explanation Problem Solution HalfduxcollisionexceedthresholdResetting or Restoring the Cisco Unified IP Phone Performing a Basic ResetRestore softkey Default softkeyPerforming a Factory Reset Using the Quality Report Tool Monitoring the Voice Quality of CallsMetric Change Condition Where to Go for More Troubleshooting Information Cleaning the Cisco Unified IP PhoneOL-15498-01 Providing Information to Users Via a Website How Users Get Copies of Cisco Unified IP Phone Manuals How Users Access a Voice Messaging System How Users Configure Personal Directory EntriesConfiguring the Synchronizer Installing the SynchronizerPrograms Cisco Systems TabSync Page OL-15498-01 Features Sccp SIPSIP QRTCisco Unified IP Phone Service Application Cisco Unified Communications Manager FeaturesServices Guide Development Notes for Release 4.13 or laterOL-15498-01 Supporting International Users Adding Language Overlays to Phone ButtonsOL-15498-01 Physical and Operating Environment Specifications Specification Value or RangeCable Specifications Network and Access Port PinoutsNetwork Port Connector Access Port ConnectorPin Number Function OL-15498-01 Basic Phone Administration Steps Example User Information for these ProceduresProceed to Configuring the Phone, page F-3 Adding a User From an External Ldap DirectoryChoose System Ldap Ldap Directory Click Perform Full Sync NowConfiguring the Phone Procedure To Select Phone Model and ProtocolProcedure to Configure Phone Example johndoeOL-15498-01 Page OL-15498-01 Choose User Management End User Click Device AssociationsPerforming Final End User Configuration Steps Click Save OL-15498-01 Numerics IN-1CDP CapfIN-2 IN-3 External power IN-4Mlpp B-2 IN-5CDP Dhcp Http RTP Sccp SIP TCP Tftp UDP IN-6QRT B-2 IN-7See Srst IN-8Dhcp DNS IN-9Vlan IN-10
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7960G, 7940G specifications

Cisco Systems has long been a leader in creating innovative networking and communication solutions. Among their range of Voice over IP (VoIP) phones, the Cisco 7960G and 7940G stand out as robust, versatile devices that cater to the needs of modern businesses. Released in the early 2000s, these models respectively combine functionality, ease of use, and key features tailored for effective communication.

The Cisco 7960G is a high-end model designed for users who demand advanced features and functionalities. It comes with a large backlit LCD display that not only enhances visibility but also provides easy navigation through various options. The phone supports up to six lines, allowing users to manage multiple calls effortlessly. Its user-friendly interface includes programmable feature buttons and a 10/100 Ethernet switch, enabling seamless integration into existing networks.

On the other hand, the Cisco 7940G is a more basic model designed for users who require essential features for their business communications. It includes a monochrome LCD screen and supports a maximum of two lines. Despite its simplicity, the 7940G is equipped with several key features such as integrated speakerphone and mute options, making it ideal for day-to-day communication needs. Both models support Power over Ethernet (PoE), eliminating the need for separate power adapters and ensuring a cleaner, more organized workspace.

In terms of technologies, both the 7960G and 7940G leverage the Session Initiation Protocol (SIP) for signaling and media exchange. They also support secure communication through protocols like Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS). This ensures that businesses can engage in confidential conversations without the risk of interception.

The characteristics that make these models appealing include durability, ease of configuration, and reliability. Organizations can benefit from Cisco’s reliable support and regular updates, ensuring that their communication infrastructure remains robust and secure. With features designed for scalability, both phones can easily integrate into larger systems while maintaining high call quality.

In summary, Cisco’s 7960G and 7940G VoIP phones are exemplary devices that cater to a variety of business communication scenarios. With their blend of functionality, support for essential technologies, and reliable performance, they continue to serve organizations effectively in an increasingly interconnected world. Whether used in a bustling office or as part of a dynamic telecommunications strategy, these models offer excellent value and performance.
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