Chapter 7 Troubleshooting and Maintenance

General Troubleshooting Tips

Step 3 On the Cisco Unified Communications Manager server, verify that the local host files have the correct Cisco Unified Communications Manager server name mapped to the correct IP address.

Step 4 From Cisco Unified Communications Manager, choose System > Server and verify that the server is referred to by its IP address and not by its DNS name.

Step 5 From Cisco Unified Communications Manager, choose Device > Phone > Find and verify that you have assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a MAC address, see the “Using Cisco Unified IP Phones with Different Protocols” section on page 2-11.

Step 6 Power cycle the phone.

Checking Power Connection

In most cases, a phone will restart if it powers up by using external power but loses that connection and switches to PoE. Similarly, a phone may restart if it powers up by using PoE and then gets connected to an external power supply.

General Troubleshooting Tips

Table 7-1provides general troubleshooting information for the Cisco Unified IP Phone.

Table 7-1

Cisco Unified IP Phone Troubleshooting

 

 

 

 

 

 

Summary

 

 

Explanation

 

 

 

 

 

Connecting a Cisco Unified IP Phone

 

Cisco does not support connecting an IP phone to another IP phone through the PC

 

to another Cisco Unified IP Phone.

 

port. Each IP phone should directly connect to a switch port. If phones are connected

 

 

 

 

together in a line (by using the PC port), the phones will not work.

 

 

 

 

 

Poor quality when calling digital cell

 

In Cisco Unified Communications Manager, you can configure the network to use

 

phones using the G.729 protocol.

 

the G.729 protocol (the default is G.711). When using G.729, calls between an IP

 

 

 

 

phone and a digital cellular phone will have poor voice quality. Use G.729 only

 

 

 

 

when absolutely necessary.

 

 

 

 

 

Prolonged broadcast storms cause

 

A prolonged Layer 2 broadcast storm (lasting several minutes) on the voice VLAN

 

IP phones to reset, or be unable to

 

may cause IP phones to reset, lose an active call, or be unable to initiate or answer

 

make or answer a call.

 

a call. Phones may not come up until a broadcast storm ends.

 

 

 

 

 

Moving a network connection from the

 

If you are powering your phone through the network connection, you must be

 

phone to a workstation.

 

careful if you decide to unplug the phone’s network connection and plug the cable

 

 

 

 

into a desktop computer.

 

 

 

 

 

 

 

 

 

 

 

Caution The computer’s network card cannot receive power through the network

 

 

 

 

 

 

connection; if power comes through the connection, the network card can

 

 

 

 

 

 

be destroyed. To protect a network card, wait 10 seconds or longer after

 

 

 

 

 

 

unplugging the cable from the phone before plugging it into a computer.

 

 

 

 

 

 

This delay gives the switch enough time to recognize that there is no

 

 

 

 

 

 

longer a phone on the line and to stop providing power to the cable.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)

7-8

OL-23874-01

 

 

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Cisco Systems 6901 manual General Troubleshooting Tips, Checking Power Connection, Summary Explanation
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6901 specifications

Cisco Systems 6901 is a versatile, compact, and powerful router designed to meet the networking needs of small to medium-sized businesses, as well as enterprise branch offices. This model is part of Cisco's ISR (Integrated Services Router) portfolio, which is known for its capability to integrate multiple services into a single platform, ensuring high efficiency and cost-effectiveness.

One of the main features of the Cisco 6901 is its ability to support advanced routing protocols, including RIP, EIGRP, OSPF, and BGP. This versatility allows for seamless integration into various network architectures, facilitating efficient communication and data transfer across multiple locations. The device is also built to handle high-bandwidth applications, making it an ideal choice for businesses that rely on robust network performance.

In terms of connectivity, Cisco 6901 offers multiple Ethernet ports, supporting both 10/100/1000 Mbps speeds. This ensures that users can connect a variety of devices, ranging from office computers to network printers, all while maintaining optimal network performance. Additionally, the router supports both LAN and WAN interfaces, providing flexibility in deployment options.

Security is a crucial aspect of networking, and the Cisco 6901 does not disappoint in this regard. It comes equipped with advanced security features, including firewall capabilities, intrusion prevention, and VPN support. These features ensure that sensitive business data is protected from unauthorized access, while also providing secure remote access for employees.

Another essential characteristic of the Cisco 6901 is its support for various multimedia applications. The router comes with Quality of Service (QoS) features that prioritize voice, video, and data traffic, ensuring high-quality performance for applications such as VoIP and video conferencing. This is particularly valuable in today's business landscape, where effective communication is critical for success.

The Cisco 6901 is also designed for ease of management and configuration. It features a user-friendly interface that simplifies the setup process, along with comprehensive monitoring tools that enable administrators to keep an eye on network performance and address any issues proactively.

In summary, the Cisco Systems 6901 is a powerful, feature-rich router that combines advanced routing capabilities with robust security measures and multimedia support. Its flexibility, ease of management, and comprehensive service integration make it an excellent choice for businesses seeking to enhance their networking infrastructure. With the Cisco 6901, organizations can achieve efficient communication, secure data exchange, and high-performance network operations, positioning themselves well for future growth.
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