Cisco Systems 7940G, 7960G manual Identifying Intermittent Network Outages, Verifying Dhcp Settings

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Chapter 8 Troubleshooting and Maintenance

Cisco Unified IP Phone Resets Unexpectedly

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 4-4for 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.

Checking Static IP Address Settings

If the phone has been assigned a static IP address, verify that you have entered the correct settings. See the “Network Configuration Menu” section on page 4-4for more information.

Verifying Voice VLAN Configuration

If the Cisco Unified IP Phone appears to reset during heavy network usage (for example, following extensive web surfing on a computer connected to same switch as phone), it is likely that you do not have a voice VLAN configured.

Isolating the phones on a separate auxiliary VLAN increases the quality of the voice traffic. See the “Understanding How the Cisco Unified IP Phone Interacts with the VLAN” section on page 2-3for details.

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

 

OL-15498-01

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Contents Text Part Number OL-15498-01 Americas HeadquartersCopyright 2008 Cisco Systems, Inc. All rights reserved N T E N T S Network Requirements Vii Configuring Security on the Cisco Unified IP PhoneViii Port 1 Network, Port 2 Access, and Port 3 Phone StatisticsCable Specifications E-2 D E Xiii OverviewAudience OrganizationCisco Unified IP Phone 7960G/7940G Series Cisco Unified Communications Manager AdministrationRelated Documentation Chapter DescriptionConvention Description Document ConventionsCisco Product Security Overview Cisco Unified Communications Manager Business EditionXvi An Overview of the Cisco Unified IP Phone Cisco Unified IP Phone 7960G An Overview of the Cisco Unified IP Phone System Guide What Networking Protocols Are Used?Networking Protocol Purpose Usage Notes Refer Cisco Unified Communications ManagerRelated Topics UDPConfiguring Telephony Features Feature OverviewRelated Topic Providing Users with Feature Information Understanding Security Features for Cisco Unified IP PhonesRefer to Cisco Unified Communications Manager Topic ReferenceRefer to Cisco Unified Communications Manager Security GuidePhone section on page 3-10for more information Overview of Supported Security FeaturesFeature Description Communications Manager Security GuideUnderstanding Security Profiles Security Restrictions Identifying Encrypted and Authenticated Phone CallsExample Capf Interaction when the Phone ResetsOL-15498-01 Purpose For More Information Administration Guide, Directory NumberRefer to the Cisco Unified Communications Manager URL Administration Guide, Softkey TemplateAdministration Guide Task Purpose For More InformationInstalling Cisco Unified IP Phones Communications Manager 7.0 Sccp Settings Network ConfigurationRefer to Cisco Unified IP Phone 7960G/7940G Series Phone Guide for Cisco UnifiedOL-15498-01 A P T E R Related Topic Providing Power to the Cisco Unified IP Phone Power Type Guidelines Power GuidelinesPower Outage Obtaining Additional Information about PowerURL Understanding Phone Configuration FilesDescription Related Topics Understanding the Phone Startup ProcessUnified Communications Manager Security Guide Request the configuration file Requires MAC Method Address? Adding Phones with Auto-RegistrationTaps Unified Communications Manager System Guide Adding Phones with Auto-Registration and TapsConverting a New Phone from Sccp to SIP Using Cisco Unified IP Phones with Different ProtocolsProcedure Adding Phones with BATConverting 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 Parameters Determining the MAC Address for a Cisco Unified IP PhoneBefore You Begin Setting Up the Cisco Unified IP PhoneNetwork and Access Ports, Handset, Speakerphone, Headset, Cisco Unified Communications Manager ConfigurationNetwork Requirements Headset Network and Access PortsHandset SpeakerphoneAudio Quality Subjective to the User Procedure Reference Installing the Cisco Unified IP PhoneBefore You Begin Cisco Unified IP Phones 7960G and 7940G Cable Connections Expansion Module Attaching the Cisco Unified IP Phone Expansion ModuleMounting the Phone to the Wall Adjusting the Placement of the Cisco Unified IP PhoneAdjusting Cisco Unified IP Phone Footstand and Phone Height Configuring Softkey Templates,Parts Used in Wall Mounting the Cisco Unified IP Phone Verifying the Phone Startup ProcessConfiguring Security on the Cisco Unified IP Phone Configuring Startup Network SettingsFrom the phone, choose Settings Security Configuration OL-15498-01 Displaying the Network Configuration Menu Configuring Network Settings on the Cisco Unified IP PhoneUnlocking and Locking Options Category Description Menu Option Overview of Network Configuration OptionsNetwork Configuration Editing ValuesPC Vlan Network Configuration MenuOption Description To Change Communications Manager Security Guide. For information Configuration Menu section onSystem 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 To Cisco Unified Communications Manager Security Guide Communications Manager Administration GuideDesignation Description Device PoolOL-15498-01 Configuring Features, Templates, Services, and Users Cisco Unified Communications Manager Feature Description Configuration ReferenceAdministration Guide, Cisco Unified IP Communications Manager Features and ServicesSpecifying Options that Appear on the User Features and Services Guide, BargeFeatures and Services Guide, Call Display Administration Guide, ConfiguringCommunications Manager System Guide Administration Guide, Configuring CiscoUnified Communications Manager Features Communications Manager System Guide, CallUnified Communications Manager DNDMlpp Features and Services Guide, MaliciousAdministration Guide, Message Waiting McidServices menu on a phone Cisco VT Advantage Administration Guide Administration Guide, Time PeriodManager Administration Guide Administration Guide, Conference BridgeCreating Custom Phone Rings Configuring Corporate and Personal DirectoriesConfiguring Corporate Directories Configuring Personal DirectorySynchronizer Modifying Phone Button TemplatesSetting Up Services Configuring Softkey TemplatesAdding 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 Status Menu Model Information ScreenSelect Status Messages Status Messages ScreenMessage Description Possible Explanation and Action Adding Phones with Cisco Unified Communications Manager AdministrationNetwork Configuration Menu section on Address. See the Network Configuration MenuConfiguration Menu section on page 4-4section for See the Firmware Versions Screen section on Configuration Menu section on page 4-4forSelect Network Statistics Network Statistics ScreenMessage Component Description Firmware Versions Screen Select Firmware Versions Expansion Module Stats ScreenSelect Expansion Module Stats Select Call Statistics Call Statistics ScreenMOS LQK Voice Quality MetricsMonitoring the Voice Quality of Calls section on CTL File Menu Security Configuration MenuCertificate Icon Trust List Menu Monitoring the Cisco Unified IP Phone Remotely Http//IPaddress Accessing the Web Page for a PhoneDevice Information Disabling and Enabling Web Page AccessChoose Device Phone Network Configuration Vlan ID Description Ethernet Statistics Network 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 Resolving Startup Problems Troubleshooting and MaintenanceTroubleshooting and Maintenance Resolving Startup Problems Identifying Error Messages Verifying IP Addressing and Routing Choose Tools Control Center Feature Services Creating a New Configuration FileSymptom Cisco Unified IP Phone Unable to Obtain IP Address Cisco Unified IP Phone Resets UnexpectedlyVerifying Physical Connection Identifying Intermittent Network Outages Verifying Dhcp SettingsChecking Static IP Address Settings Verifying Voice Vlan ConfigurationEliminating DNS or Other Connectivity Errors Verifying that the Phones Have Not Been Intentionally ResetProblem Possible Cause Troubleshooting Cisco Unified IP Phone SecuritySummary Explanation General Troubleshooting TipsOptions section on page 4-2for details Summary Explanation Halfduxcollisionexceedthreshold Problem SolutionDefault softkey Resetting or Restoring the Cisco Unified IP PhonePerforming a Basic Reset Restore softkeyPerforming a Factory Reset Monitoring the Voice Quality of Calls Using the Quality Report ToolMetric Change Condition Cleaning the Cisco Unified IP Phone Where to Go for More Troubleshooting InformationOL-15498-01 Providing Information to Users Via a Website How Users Get Copies of Cisco Unified IP Phone Manuals How Users Configure Personal Directory Entries How Users Access a Voice Messaging SystemConfiguring the Synchronizer Installing the SynchronizerPrograms Cisco Systems TabSync Page OL-15498-01 Sccp SIP FeaturesQRT SIPDevelopment Notes for Release 4.13 or later Cisco Unified IP Phone Service ApplicationCisco Unified Communications Manager Features Services GuideOL-15498-01 Adding Language Overlays to Phone Buttons Supporting International UsersOL-15498-01 Specification Value or Range Physical and Operating Environment SpecificationsAccess Port Connector Cable SpecificationsNetwork and Access Port Pinouts Network Port ConnectorPin Number Function OL-15498-01 Example User Information for these Procedures Basic Phone Administration StepsClick Perform Full Sync Now Proceed to Configuring the Phone, page F-3Adding a User From an External Ldap Directory Choose System Ldap Ldap DirectoryExample johndoe Configuring the PhoneProcedure To Select Phone Model and Protocol Procedure to Configure PhoneOL-15498-01 Page OL-15498-01 Click Device Associations Choose User Management End UserPerforming Final End User Configuration Steps Click Save OL-15498-01 IN-1 NumericsCDP CapfIN-2 IN-3 IN-4 External powerIN-5 Mlpp B-2IN-6 CDP Dhcp Http RTP Sccp SIP TCP Tftp UDPIN-7 QRT B-2IN-8 See SrstIN-9 Dhcp DNSIN-10 Vlan
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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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