Chapter 6 Viewing Model Information, Status, Statistics, and Security Information on the Cisco Unified IP Phone

Call Statistics Screen

Table 6-4 Call Statistics Items (continued)

Item

Avg Jtr

Max Jtr

RxDisc

RxLost

Description

Estimated average RTP packet jitter (dynamic delay that a packet encounters when going through the network) observed since the receiving voice stream was opened.

Maximum jitter observed since the receiving voice stream was opened.

Number of RTP packets in the receiving voice stream that have been discarded (bad packets, too late, and so on).

Note The phone will discard payload type 19 comfort noise packets that are generated by Cisco Gateways, which will increment this counter.

Missing RTP packets (lost in transit).

Voice Quality Metrics

MOS LQK

Score that is an objective estimate of the mean opinion score (MOS) for

 

listening quality (LQK) that rates from 5 (excellent) to 1 (bad). This score

 

is based on audible concealment events due to frame loss in the preceding

 

8-second interval of the voice stream. For more information, see the

 

“Monitoring the Voice Quality of Calls” section on page 8-15.

 

Note The MOS LQK score can vary based on the type of codec that the

 

Cisco Unified IP Phone uses.

 

 

Avg MOS LQK

Average MOS LQK score observed for the entire voice stream.

 

 

Min MOS LQK

Lowest MOS LQK score observed from start of the voice stream.

 

 

Max MOS LQK

Baseline or highest MOS LQK score observed from start of the voice

 

stream.

 

These codecs provide the following maximum MOS LQK score under

 

normal conditions with no frame loss:

 

• G.711 gives 4.5

 

• G.729 A /AB gives 3.7

 

 

MOS LQK Version

Version of the Cisco proprietary algorithm used to calculate MOS LQK

 

scores.

 

 

Cmltve Conceal Ratio

Total number of concealment frames divided by total number of speech

 

frames received from start of the voice stream.

 

 

Interval Conceal Ratio

Ratio of concealment frames to speech frames in preceding 3-second

 

interval of active speech. If using voice activity detection (VAD), a longer

 

interval might be required to accumulate 3 seconds of active speech.

 

 

Max Conceal Ratio

Highest interval concealment ratio from start of the voice stream.

 

 

Conceal Secs

Number of seconds that have concealment events (lost frames) from the

 

start of the voice stream (includes severely concealed seconds).

 

 

Severely Conceal Secs

Number of seconds that have more than 5 percent concealment events (lost

 

frames) from the start of the voice stream.

 

 

 

 

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 Voice Quality Metrics, Mos Lqk, Monitoring the Voice Quality of Calls section on
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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.
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