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Cisco Systems 7940G, 7960G manual Summary Explanation

Models: 7960G 7940G

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Chapter 8 Troubleshooting and Maintenance

General Troubleshooting Tips

Table 8-2

Cisco Unified IP Phone Troubleshooting (continued)

 

 

 

Summary

 

Explanation

 

 

Sound sample mismatch between the

The RxSize and the TxSize statistics show the size of the voice packets that are being

phone and another device.

used in a conversation between this IP phone and the other device. The values of these

 

 

statistics should match.

 

 

See the “Call Statistics Screen” section on page 6-10for information about displaying

 

 

these statistics.

 

 

Gaps in voice calls.

Check the AvgJtr and the MaxJtr statistics. A large variance between these statistics

 

 

might indicate a problem with jitter on the network or periodic high rates of network

 

 

activity.

 

 

See the “Call Statistics Screen” section on page 6-10for information about displaying

 

 

these statistics.

 

 

Checking signaling.

To check that signaling is working properly between the phone and Cisco

 

 

Unified Communications Manager, press the Speaker button on the phone to answer

 

 

a call. If you can answer a call and if you hear a dial tone, signaling is working

 

 

properly.

 

 

Checking the handset cradle clip.

Cisco Unified IP Phones are designed with a reversible handset clip in the cradle. This

 

 

clip is used with the plastic tab protruding out when the phone is in a vertical

 

 

(wall-mounted) position. The position of the tab can interfere with the handset as it is

 

 

placed in the cradle. If the phone remains in the on-hook position you may experience

 

 

continued ringing when you try to answer a call or a lack of dial tone when you try to

 

 

place a call. To resolve this problem, you may need to reverse the clip.

 

 

If the handset cradle clip is in the wall-mounted position and your phone is placed on

 

 

a desktop, slide the clip upward to remove it. Rotate the clip 180 degrees and slide it

 

 

back in so that the tab is hidden.

 

 

If the hook switch remains in the down position, tapping on the phone should free up

 

 

the switch. You can also try pushing and suddenly releasing the off-hook button after

 

 

the handset has been picked up.

 

 

Checking the hook switch contacts.

The hook switch contacts on the phone use a wiping action to self-clean the contacts.

 

 

If your phone is not used regularly, dust and other airborne contaminants may degrade

 

 

the contact performance and cause problems with operation. If you have periods of

 

 

limited phone usage, you can clean the contacts by quickly pressing and releasing the

 

 

hook switch a dozen times.

 

 

Checking the position of the phone.

The footstand of the phone allows adjustment of the phone to eliminate glare on the

 

 

LCD screen. When the phone is in the most vertical position, the phone may be forced

 

 

forward and the handset may not sit properly in the cradle, creating a false off-hook

 

 

condition. Cisco recommends that you position the phone one notch from the most

 

 

vertical position to ensure that the handset is firmly resting on the hook switch.

 

 

Checking the LAN cable.

Make sure that the LAN cable connected to the phone is positioned properly. The LAN

 

 

cable should pass out of the side of the phone between the base and the footstand. If

 

 

you are using a cable (such as Cat-5E or Cat-6) with a larger diameter than the cable

 

 

that was packaged with your phone, the cable may cause the phone to tilt forward and

 

 

force it off-hook. Use a smaller LAN cable to eliminate this problem.

 

 

 

 

 

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

 

 

 

 

 

 

OL-15498-01

 

 

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Cisco Systems 7940G, 7960G manual Summary Explanation
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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.