Chapter 6 Troubleshooting and Maintenance

Resolving Startup Problems

To create a new configuration file, follow these steps:

Procedure

Step 1 From Cisco Unified Communications Manager, choose Device > Phone > Find to locate the phone experiencing problems.

Step 2 Choose Delete to remove the phone from the Cisco Unified Communications Manager database.

Step 3 Add the phone back to the Cisco Unified Communications Manager database. See Attaching a Phone to the ATA 187, page 3-3for details.

Step 4 Power cycle the phone.

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. See the Cisco Unified Communications Manager Administration Guide for more information.

Note 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.

Registering the Phone with Cisco Unified Communications Manager

A phone can register with a Cisco Unified Communications Manager server only if the phone has been added to the server or if auto-registration is enabled. Review the information and procedures in the Attaching a Phone to the ATA 187, page 3-3to ensure that the phone has been added to the

Cisco Unified Communications Manager database.

To verify that the phone is in the Cisco Unified Communications Manager database, choose Device > Phone > Find from Cisco Unified Communications Manager Administration to search for the phone based on its MAC Address. For information about determining a MAC address, see Determining the MAC Address of an ATA 187, page 2-7.

If the phone is already in the Cisco Unified Communications Manager database, its configuration file may be damaged. See Adding Users to Cisco Unified Communications Manager, page 4-6for assistance.

Symptom: ATA 187 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 Administration Guide for Cisco Unified Communications Manager 8.0

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OL-21035-01

 

 

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Cisco Systems OL-21035-01 manual Symptom ATA 187 Unable to Obtain IP Address
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OL-21035-01 specifications

Cisco Systems OL-21035-01 refers to a specific product or course pertaining to networking technologies offered by Cisco. While details of OL-21035-01 may allude to various learning modules, let’s explore its primary features, technologies, and characteristics that highlight the significance of Cisco’s offerings in the IT landscape.

At its core, OL-21035-01 encapsulates essential networking principles and is likely part of Cisco's extensive training portfolio focused on solidifying foundational knowledge in networking. One prominent feature includes a comprehensive curriculum that covers advanced routing and switching concepts. This ensures participants are well-equipped to manage and maintain modern network infrastructures, which are critical in today’s connectivity-driven world.

The learning materials may also leverage dynamic teaching methodologies, engaging participants through simulations and practical labs. This experiential learning approach allows individuals to demonstrate proficiency in configuring Cisco routers and switches, troubleshooting network problems, and implementing strategies for optimizing performance.

In terms of technologies, OL-21035-01 aligns closely with modern networking trends such as Software-Defined Networking (SDN), Internet of Things (IoT), and cloud computing. Understanding these technologies is essential as organizations increasingly rely on scalable, flexible, and intelligent network solutions. The program may also delve into Cisco's proprietary technologies like Cisco IOS, which is fundamental for managing network devices.

Another characteristic of OL-21035-01 is its alignment with industry standards and best practices. This ensures that professionals undergoing training are prepared for real-world scenarios they will face while managing enterprise-level networks. Cisco certifications, often obtainable through these courses, are recognized globally and can significantly enhance career prospects.

Additionally, OL-21035-01 stresses the importance of security in networking. Participants learn about robust security protocols, firewall configurations, and strategies to protect networks against cyber threats, ensuring that they remain resilient in the face of growing security challenges.

Lastly, Cisco’s emphasis on continuous learning is mirrored in the iterative nature of its offerings, encouraging IT professionals to stay updated with the latest advancements in technology. Consequently, OL-21035-01 not only serves as a stepping stone in one’s career but also fosters a culture of lifelong learning, vital for navigating the ever-evolving tech landscape.

In summary, OL-21035-01 embodies a holistic approach to networking education, focusing on critical skills development, contemporary technologies, and a robust understanding of security measures necessary for thriving in the IT sector.
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