Understanding Phone Configuration Files

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding the Phone Startup Process

Configuration files for a phone are stored on the TFTP server and define parameters for connecting to Cisco Unified CallManager. In general, any time you make a change in Cisco Unified CallManager that requires the phone to be reset, a change is made to the phone’s configuration file automatically.

Configuration files also contain information about which image load the phone should be running. If this image load differs from the one currently loaded on a phone, the phone contacts the TFTP server to request the new image file.

In addition, if the device security mode in the configuration file is set to Authenticated, the phone contains a valid LSC, and the CTL file on the phone has a valid certificate for Cisco Unified CallManager, the phone establishes a TLS connection to Cisco Unified CallManager. Otherwise, the phone establishes a TCP connection.

Note If the device security mode in the configuration file is set to Authenticated or Encrypted but the phone does not contain a valid LSC or the CTL file on the phone does not have a valid certificate for Cisco Unified CallManager, the phone will continuously try to obtain a CTL file or try to install a valid certificate so that it can register securely.

A phone requests a configuration file whenever it resets and registers with

Cisco Unified CallManager.

Note If a phone receives a CTL file with a valid certificate for the TFTP server, the phone requests a signed.cnf.xml.sgn configuration file instead the .cnf.xml file.

A phone accesses a default configuration file named XmlDefault.cnf.xml from the TFTP server when the following conditions exist:

•You have enabled auto-registration in Cisco Unified CallManager

•The phone has not been added to the Cisco Unified CallManager Database

•The phone is registering for the first time

•The phone encounters an error while attempting to retrieve its configuration file from the TFTP server

All other times, a phone accesses a .cnf.xml file corresponding to its device name.

		Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 4.2, Cisco Unified IP Phones

2-8		OL-8555-01
2-8		OL-8555-01

OL-8555-01 specifications

Cisco Systems OL-8555-01 is a comprehensive course designed for IT professionals seeking to enhance their understanding of Cisco Unified Computing System (UCS) and Data Center networking technologies. This course focuses on the configuration, management, and troubleshooting of UCS environments and is targeted towards system administrators, engineers, and network professionals involved in data center operations.

One of the main features of the OL-8555-01 course is its emphasis on the fundamental concepts of UCS architecture. Participants are introduced to the UCS components, including blade servers, chassis, Fabric Interconnects, and the integrated management platform, UCS Manager. Understanding these components is critical for managing virtualized environments effectively, which is a significant aspect of modern data center management.

The course delves into several key technologies integral to UCS, including virtualization, automation, and orchestration. Emphasizing the importance of virtualization, OL-8555-01 covers how UCS enables the deployment of multiple virtual machines on a single physical server, optimizing resource utilization and improving scalability. Moreover, it discusses the role of automation in simplifying operations, reducing manual tasks, and minimizing errors. Participants learn about automation tools that can streamline repetitive administrative tasks, enhancing overall operational efficiency.

Another characteristic of the OL-8555-01 course is its comprehensive coverage of UCS management tools. Students gain hands-on experience with UCS Manager, learning how to navigate its interface, configure policies, and monitor system performance. This practical knowledge is vital for anyone responsible for maintaining reliable and efficient data center operations.

Security is also a crucial topic within the OL-8555-01 curriculum. The course equips participants with an understanding of the security policies and best practices necessary to protect sensitive data and ensure compliance within the UCS framework.

Overall, OL-8555-01 is a valuable resource for IT professionals aiming to deepen their technical expertise in Cisco's UCS ecosystem. The combination of theoretical knowledge and hands-on practice prepares participants for real-world scenarios, allowing them to make informed decisions about their data center environments. Completing this course not only enhances career prospects but also empowers individuals to drive innovation and efficiency in modern data centers.