Chapter 8 Troubleshooting and Maintenance

Cisco Unified IP Phone Resets Unexpectedly

Note

• When you remove a phone from the Cisco Unified Communications Manager database, its

 

configuration file is deleted from the Cisco Unified Communications Manager TFTP server. The

 

phone’s directory number or numbers remain in the Cisco Unified Communications Manager

 

database. They are called “unassigned DNs” and can be used for other devices. If unassigned DNs

 

are not used by other devices, delete them from the Cisco Unified Communications Manager

 

database. You can use the Route Plan Report to view and delete unassigned reference numbers.

 

Refer to Cisco Unified Communications Manager Administration Guide for more information.

 

• Changing the buttons on a phone button template, or assigning a different phone button template to

 

a phone, may result in directory numbers that are no longer accessible from the phone. The directory

 

numbers are still assigned to the phone in the Cisco Unified Communications Manager database, but

 

there is no button on the phone with which calls can be answered. These directory numbers should

 

be removed from the phone and deleted if necessary.

 

 

Symptom: Cisco Unified IP Phone Unable to Obtain IP Address

If a phone is unable to obtain an IP address when it starts up, the phone may be not be on the same network or VLAN as the DHCP server, or the switch port to which the phone is connected may be disabled.

Make sure that the network or VLAN to which the phone is connected has access to the DHCP server, and make sure that the switch port is enabled.

Cisco Unified IP Phone Resets Unexpectedly

If users report that their phones are resetting during calls or while idle on their desk, you should investigate the cause. If the network connection and Cisco Unified Communications Manager connection are stable, a Cisco Unified IP Phone should not reset on its own.

Typically, a phone resets if it has problems connecting to the Ethernet network or to

Cisco Unified Communications Manager. These sections can help you identify the cause of a phone resetting in your network:

•Verifying Physical Connection, page 8-6

•Identifying Intermittent Network Outages, page 8-7

•Verifying DHCP Settings, page 8-7

•Checking Static IP Address Settings, page 8-7

•Verifying Voice VLAN Configuration, page 8-7

•Verifying that the Phones Have Not Been Intentionally Reset, page 8-8

•Eliminating DNS or Other Connectivity Errors, page 8-8

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.

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

8-6

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Cisco Systems 7960G Cisco Unified IP Phone Resets Unexpectedly, Symptom Cisco Unified IP Phone Unable to Obtain IP Address
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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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