Cisco 7920 Error Message − Registration Rejected

This message means that the Cisco CallManager server with which the Cisco 7920 attempted to register does not have an entry for the phone, and Auto−Registration is not enabled. Refer to Troubleshooting Cisco IP Phone (7910, 7940, 7960, 12SP, and VIP30) Registration Problems with Cisco CallManager 3.x for further information.

When the Cisco 7920 has successfully registered with the CallManager server, you have completed this task.

Cisco 7920 Error Message − Connecting to CallManager 0−5

This message means that the Cisco 7920 is not able to contact a CallManager server. The phone will try to contact Cisco CallManager servers until it successfully contacts a server or until it is turned off.

There are two common causes for this problem: incorrect WEP keys and IP routing problems.

Incorrect WEP Keys

Incorrect WEP keys will cause the Cisco 7920 to send IP packets that are not decrypted properly by the Cisco Aironet 1200 AP. This problem has the same symptoms as a loss of IP connectivity. Verify that the Cisco 7920 and the Cisco Aironet 1200 AP have the same WEP keys configured.

∙See Step 15 in Configuring the Cisco 7920 for information on Cisco 7920 Network Security.

∙See Step 6 in Configuring the Cisco Aironet 1200 AP for information on Cisco Aironet 1200 AP Radio Data Encryption.

IP Routing Problems

DHCP IP Parameters￿Troubleshooting DHCP problems is beyond the scope of this document. Refer to Solving DHCP and TFTP Problems with Windows 2000 and CallManager IP Phones for more information.

As an alternative, you can use static IP parameters to eliminate the DHCP server from the configuration, so that you can continue to troubleshoot the Cisco 7920￿s registration process. See the Configuring the Cisco 7920 section of this document to configure a static IP address. Select an IP address from the appropriate subnet that is not already in use on the network. Turn the Cisco 7920 off and back on again, after you have configured the static IP address.

Static IP Parameters￿Verify that the static IP parameters on the Cisco 7920 have been entered correctly. Choose Menu > Network Config > Current Config to do this on the Cisco 7920 itself. You can also use the Cisco 7920 Configuration Utility to verify these settings.

Cisco 7920 Configuration Utility Can Not Connect to 7920 − Connection Busy

If the Cisco 7920 is communicating with another device (for example, it is attempting to register with a CallManager) and you try to connect to it with the Cisco 7920 Configuration Utility to import or export a configuration, then you will occasionally encounter this error message. If the Cisco 7920 can successfully register with the CallManager server, then wait for it to complete the registration process step before you use the Cisco 7920 Configuration Utility.

If the Cisco 7920 can not register with the CallManager server and it continues to retry the registration process and you can not access the Cisco 7920 from the Configuration Utility, then you need to stop the Cisco 7920 from being able to authenticate and associate with the Cisco Aironet 1200 AP.

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Cisco Systems appendix Cisco 7920 Error Message − Registration Rejected, IP Routing Problems
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7920 specifications

Cisco Systems, a leading player in the global networking and communications technology sector, designed the Cisco 7920 Wireless IP Phone for mobile professionals seeking seamless connectivity in various environments. Primarily aimed at enhancing communication within enterprise settings, this wireless device offers a plethora of features that cater to the specific needs of businesses.

At the core of the Cisco 7920 is its robust wireless functionality. It operates on IEEE 802.11b/g wireless protocols, allowing users to connect effortlessly to Wi-Fi networks. This flexibility enables employees to communicate effectively from various locations within an office space, promoting mobility and collaboration without being tethered to a desk.

The ergonomic design of the Cisco 7920 prioritizes user comfort. Its lightweight casing and intuitive button layout ensure that users can navigate the interface with ease. The device is equipped with a vibrant color display, allowing for clear visibility of caller ID, call status, and menu options, enhancing the user experience further. Additionally, the handset supports a wide variety of languages, making it suitable for global teams.

In terms of features, the Cisco 7920 is loaded with advanced capabilities. It supports voice over IP (VoIP), delivering high-quality audio and ensuring reliable communication. Users benefit from features like a contextual menu, call hold, transfer, conference calling, and voicemail access on the go. The phone also offers a wide range of ringtones, allowing customization to suit personal preferences or company branding.

Security is a crucial aspect of modern telecommunications, and the Cisco 7920 does not fall short. It incorporates industry-standard security protocols such as Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA), safeguarding communications from potential threats.

Moreover, the Cisco 7920 integrates seamlessly with Cisco Unified Communications Manager, enabling centralized management and control. This integration ensures that IT departments can deploy, manage, and troubleshoot devices efficiently, streamlining operations while ensuring optimal performance.

In conclusion, the Cisco 7920 Wireless IP Phone stands out as a versatile communication tool designed for the fast-paced workplace. Its combination of wireless connectivity, ergonomic design, advanced features, and robust security makes it an essential accessory for businesses looking to elevate their communication strategies. With its established reputation, Cisco continues to support companies in achieving seamless connectivity and effective collaboration.
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