Cisco Cisco Unified Service Monitor 8.6 Weißbuch

 

White Paper 

 

© 2007 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. 

Page 4 of 26

The network infrastructure must meet the following requirements: 

● 

Packet loss must not be more than 1 percent 

● 

Average one-way jitter must not be more than 30 ms 

● 

One-way delay must be under 150 ms 

To help ensure good voice quality, it is imperative to keep jitter and packet loss under control by 
paying close attention to voice impairment factors.  

By now, you have a basic understanding of the voice impairment parameters and their importance 
in voice quality measurement. Some of the key requirements for a voice quality measurement 
product follow. It must: 

● 

Be able to calculate voice quality for actual calls. Although it is possible to generate 
synthetic voice traffic and calculate voice quality for these calls, the voice quality generated 
from synthetic calls does not represent end-user experience. The capability to simulate 
voice traffic must be made use of to verify voice quality when a real-time alert is received. 

● 

Provide details of voice impairment parameters such as jitter, packet loss, and so on. It is 
important to understand the cause of voice quality degradation; for example, knowing 
whether jitter or packet loss is causing the problem will help in fine-tuning the network, if 
required. 

● 

Report voice quality in real time. For example, in a call that lasts for 5 minutes, if the user 
encounters voice quality problems in the second minute, it is important for the administrator 
to get an alert at the second minute rather than at the end of the conversation. 

● 

Provide details about the endpoints involved in a conversation, the type of codec used, and 
the IP addresses and phone numbers of the endpoints. Such detailed information is 
important in troubleshooting a voice quality problem. 

● 

Be scalable and easily deployable. 

● 

Be noninstrusive. 

The Cisco

®

 Unified Communications Family of products can be divided into two parts: 

● 

Cisco Unified Communications infrastructure 

● 

Application infrastructure 

The Cisco Unified Communications infrastructure consists primarily of call-processing devices such 
as Cisco Unified Communications Manager, Cisco Unified Communications Manager Express, 
Cisco Unity

®

, and Cisco Unity Express. The Cisco Unified Communications infrastructure layer is 

the brain of the Cisco Unified Communications Family of products, and it performs the critical 
functions of call setup, call routing and call tear-down. 

The application infrastructure consists of software applications such as Cisco Emergency 
Responder, MeetingPlace

®

, MeetingPlace Express, IP Contact Center, IP Contact Center Express, 

and Personal Assistant. These applications provide added functionality to the Cisco Unified 
Communications family of products.