Cisco Systems 7911G manual Verifying Physical Connection, Identifying Intermittent Network Outages

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Chapter 9 Troubleshooting and Maintenance

Cisco Unified IP Phone Resets Unexpectedly

Verifying Physical Connection

Verify that the Ethernet connection to which the Cisco Unified IP Phone is connected is up. For example, check if the particular port or switch to which the phone is connected is down.

Identifying Intermittent Network Outages

Intermittent network outages affect data and voice traffic differently. Your network might have been experiencing intermittent outages without detection. If so, data traffic can resend lost packets and verify that packets are received and transmitted. However, voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the phone resets and attempts to reconnect its network connection.

If you are experiencing problems with the voice network, you should investigate whether an existing problem is simply being exposed.

Verifying DHCP Settings

The following suggestions can help you determine if the phone has been properly configured to use DHCP:

1.Verify that you have properly configured the phone to use DHCP. See the “Network Configuration Menu” section on page 4-7for more information.

2.Verify that the DHCP server has been set up properly.

3.Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.

Cisco Unified IP Phones send messages with request type 151 to renew their DHCP address leases. If the DHCP server expects messages with request type 150, the lease will be denied, forcing the phone to restart and request a new IP address from the DHCP server.

 

 

Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager

 

 

 

 

 

 

OL-10008-01

 

 

9-9

 

 

 

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Contents Cisco Unified IP Phone 7906G and 7911G Page Copyright 2006 Cisco Systems, Inc. All rights reserved Page N T E N T S Security Restrictions Vii SafetyViii Configuring Features, Templates, Services, and UsersPNG File Requirements for Custom Background Images Symptom The Cisco Unified IP Phone Does Not Register with Supporting International Users B-1 Xii Xiii OverviewAudience Xiv OrganizationAppendix B, Supporting International Users Appendix C, Technical SpecificationsCisco Unified CallManager Administration Related DocumentationXvi Obtaining DocumentationCisco.com Xvii Documentation FeedbackProduct Documentation DVD Ordering Documentation Xviii Cisco Product Security OverviewXix Reporting Security Problems in Cisco ProductsFor Emergencies only security-alert@cisco.com Cisco Technical Support & Documentation Website Obtaining Technical AssistanceXxi Submitting a Service RequestDefinitions of Service Request Severity Xxii Obtaining Additional Publications and InformationXxiii Xxiv Document ConventionsConvention Description Xxv Waarschuwing Belangrijke VeiligheidsinstructiesVaroitus Tärkeitä Turvallisuusohjeita Xxvi Warnung Wichtige SicherheitshinweiseAvvertenza Importanti Istruzioni Sulla Sicurezza Xxvii Aviso Instruções Importantes DE SegurançaXxviii Varning! Viktiga SäkerhetsanvisningarXxix Xxx GEM Disse AnvisningerXxxi Xxxii An Overview Cisco Unified IP Phone Understanding the Cisco Unified IP Phones 7906G and 7911G Cisco Unified IP Phones 7906G and 7911G What Networking Protocols Are Used? Dhcp Networking Protocol Purpose Usage NotesSrtp Related Topics What Features are Supported?UDP Feature Overview Related Topic Configuring Telephony FeaturesTelephony Features Available for the Phone, Providing Users with Feature Information Understanding Security Features for Cisco Unified IP PhonesTopic Reference Phone Security section on Overview of Supported Security FeaturesSee the Troubleshooting Cisco Unified IP See the Resetting or RestoringSection on page 3-17 for more information Feature DescriptionConfiguring Security on the Cisco Unified IP Phone Capf Garp Identifying Encrypted and Authenticated Phone CallsDevice Configuration Menu section on Security Restrictions Cisco Unified CallManager Database section on OL-10008-01 Task Purpose For More Information Phone Configuration window CallManager database Softkey Templates See the ConfiguringSee the Setting Up Services section onEr section on Installing Cisco Unified IP PhonesSee the Adding Users to Cisco Unified CallManag7906G and 7911G See the Providing PowerSee the Installing Cisco Unified IP PhonesSecurity on Startup Network SettingsConfiguration Menu Users See Appendix aProviding Information to OL-10008-01 Preparing to Install Cisco Unified IP Phone on Your Network OL-10008-01 Vlan Power Outage Providing Power to Cisco Unified IP Phones 7906G and 7911GPower Type Guidelines Power GuidelinesObtaining Additional Information about Power URL Understanding Phone Configuration FilesUnderstanding the Phone Startup Process Vlan Step Description Related TopicsCisco Unified CallMan See the Understanding Phone ConfigurationRequires MAC Method Address? Adding Phones to the Cisco Unified CallManager DatabaseAdding Phones with Auto-Registration Adding Phones with Auto-Registration and Taps MAC Address of a Cisco Unified IP Phone section on Adding Phones with Cisco Unified CallManager AdministrationAdding Phones with BAT Determining the MAC Address of a Cisco Unified IP PhoneOL-10008-01 Before You Begin Setting Up the Cisco Unified IP PhoneNetwork Requirements Handset, Speaker, Installing the Cisco Unified IP Phone,Safety Cisco Unified CallManager ConfigurationSetting Up the Cisco Unified IP Phone Before You Begin Handset Network and Access PortsNetwork and Access Ports, Handset, Speaker, Headset, Speaker Monitor ModeActivating Group Listen on the Phone HeadsetAudio Quality Subjective to User Connecting a Headset Installing the Cisco Unified IP PhoneProcedure Reference 154887 154389 Cisco Unified IP Phone Model 7906G Cable Connections Cisco Unified IP Phone Model 7911G Cable Connections Before You Begin ProcedureMounting the Phone to a Wall Verifying the Phone Startup Process Configuring Startup Network SettingsSettings on the Cisco Unified IP Phone Configuring Security on the Cisco Unified IP PhoneCisco Unified CallManager Administration Guide Related Topic OL-10008-01 Configuring Settings on Cisco Unified IP Phone Displaying a Configuration Menu Unlocking and Locking Options Editing the Values of an Option Setting Overview of Options Configurable from a Phone Category Description Option Network Configuration MenuOption Description To Change Network Configuration MenuOption Description To Change CTL File Screen section on To the CTL File Screen section Vlan ID Option Description To Change Option Description To Change PC Vlan CallManager Configuration Menu Device Configuration MenuState Tftp Designation DescriptionSrst URL Http Configuration MenuLocale Configuration Menu Media Configuration Menu UI Configuration MenuSecurity Configuration Menu Ethernet Configuration Menu10 Security Configuration Menu Options Displaying a Configuration Menu, Network Configuration Menu, QoS Configuration MenuNetwork Configuration Configuring Features, Templates Services, and Users Feature Description Configuration Reference Telephony Features Available for the PhoneSystem Guide, Understanding Administration Guide, Feature Call CMC System Guide, Call Pickup FACMcid Administration Guide , Meet-MeMlpp System Guide, Voice MailQRT Button Templates section onAdministration Guide, Time Templates section on See the Configuring SoftkeyConfiguring Personal Directory Configuring Corporate DirectoriesModifying Phone Button Templates Configuring Softkey TemplatesSetting Up Services Adding Users to Cisco Unified CallManager Specifying Options that Appear on the User Options Web Pages OL-10008-01 Creating Custom Phone Rings Customizing Cisco Unified IP PhoneRing CiscoIPPhoneRingList RingList.xml File Format RequirementsPCM File Requirements for Custom Ring Types Configuring a Custom Phone RingList.xml File Format Requirements Creating Custom Background ImagesList.xml Example PNG File Requirements for Custom Background Images Configuring a Custom Background ImageOL-10008-01 OL-10008-01 A P T E R Security Configuration Menu CTL File Screen CTL File Information Trust List Screen Model Information Screen LSC Status MenuCTL MICPress the Applications Menu button Status Messages ScreenStatus Adding Phones with Cisco Unified CallManager Administration section onNetwork Configuration Menu section Message Description Possible Explanation and ActionAddress Configuration Menu section onMenu section on page 4-7 section for Address. See the Network ConfigurationSection on page 7-19 to verify the phone Network Configuration Menu section onPhone. See the Firmware Versions Screen Section on page 4-7 section for details See the Network Configuration MenuOn page 4-7for details on assigning a Network Statistics Screen Select Network Statistics PC port is in a link up state and has auto-negotiated Firmware Versions Screen OL-10008-01 Monitoring the Cisco Unified IP Phone Remotely Device Logs, Streaming Statistics, Accessing the Web Page for a PhoneDisabling Web Page Access Device Information Monitoring the Cisco Unified IP Phone Remotely UDI Network Configuration Description Description Description Description Network Statistics Ethernet Information Area Items OL-10008-01 Device Logs Streaming Statistics Streaming Statistics OL-10008-01 Troubleshooting and Maintenance Resolving Startup Problems Troubleshooting and Maintenance Resolving Startup Problems Identifying Error Messages Verifying Tftp Server Settings Verifying DNS Settings Creating a New Configuration File Cisco Unified IP Phone Resets Unexpectedly Identifying Intermittent Network Outages Verifying Dhcp SettingsVerifying Physical Connection Verifying Voice Vlan Configuration Checking Static IP Address SettingsEliminating DNS or Other Connectivity Errors Problem Possible Cause General Troubleshooting TipsSummary Explanation Halfduxcollisionexceedthreshold Unlocking and Locking Options section on page 4-3 forOperation Performing Explanation Performing a Basic ResetPerforming a Basic Reset, Performing a Factory Reset, Section on page 4-3 . The press Performing a Factory ResetLocking Options section on Unlocking and Locking OptionsUsing the Quality Report Tool Where to Go for More Troubleshooting Information Cleaning the Cisco Unified IP PhoneHow Users Obtain Support for the Cisco Unified IP Phone Providing Information to UsersHow Users Get Copies of Cisco Unified IP Phone Manuals How Users Subscribe to Services and Configure Phone FeaturesCisco Unified CallManager section on How Users Access a Voice Messaging SystemHow Users Configure Personal Directory Entries Supporting International Users Appendix B Supporting International Users Specification Value or Range Technical SpecificationsPin Number Function Cable SpecificationsNetwork and Access Port Pinouts Network Port ConnectorRD+ Access Port ConnectorOL-10008-01 IN-1 NumericsIN-2 IN-3 IN-4 IN-5 IN-6 IN-7 IN-8 IN-9 IN-10 IN-11 IN-12 Wall mounting Web Access Enabled 4-22webPage USA
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7906G, 7911G specifications

The Cisco Systems 7911G is a versatile IP phone designed to enhance communication in enterprise environments. Targeting workers in various organizational settings, this model is known for its reliability, ease of use, and robust features that cater to both basic and advanced telephony requirements.

One of the key features of the Cisco 7911G is its support for Voice over IP (VoIP) technology. Using this technology allows for the transmission of voice signals over the internet rather than through traditional telephone lines. This not only reduces telephony costs but also offers enhanced functionality that integrates seamlessly with existing communication systems.

The phone is equipped with a monochrome graphical display that provides users with clear visibility of their call status, directory information, and menu options. With a resolution of 128x64 pixels, the screen is large enough to offer important information without overwhelming the user. This simplicity makes it an ideal choice for users who require straightforward functionality without the complexity of advanced features.

Ergonomically designed, the Cisco 7911G features a comfortable keypad with dedicated buttons for frequently used functions such as mute, hold, and transfer. It supports multiple lines, providing users with the ability to manage multiple calls simultaneously. Additionally, it offers programmable line keys that can be customized for speed dial or as soft keys for quick access to features.

The device supports Power over Ethernet (PoE), which allows the phone to receive power through the network cable rather than needing a separate power source. This feature not only simplifies installation but also enhances mobility within the workspace, as it reduces cable clutter.

Another significant characteristic of the Cisco 7911G is its compatibility with Cisco Unified Communications Manager, which ensures centralized management of telephony systems. It also supports a range of audio codecs that help in delivering high-quality audio during calls, reducing latency and improving overall communication quality.

Security is also a focus with the Cisco 7911G, as it features a secure access feature that includes Transport Layer Security (TLS) and Secure Real-Time Transport Protocol (SRTP) for encrypted voice communications. This ensures that sensitive conversations are protected from eavesdropping.

Overall, the Cisco Systems 7911G is a reliable, feature-rich IP phone that provides an excellent solution for organizations looking to upgrade their communication systems. Its combination of user-friendly design, powerful integrations, and security features makes it a cornerstone in the suite of Cisco telecommunications solutions.
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