Cisco Cisco Prime Collaboration Assurance 11.5 White Paper

 

 

© 2016 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. 

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CS: Concealed seconds represents the time during which some concealment is observed during a call. 

● 

SCS: Severely concealed seconds represents the time during which a significant amount of concealment is 

observed. If the concealment that is observed is usually greater than 50 milliseconds or approximately 5 

percent, the speech probably does not seem very audible. 

Cisco Prime Collaboration Assurance and Analytics 11.0 uses SCSR (that is, SCS ÷ call duration to grade good, 

acceptable, or poor) listening audio quality. The advantages of using SCSR include the following: 

● 

It is simple and intuitive because SCSR is based on raw, network-oriented, packet-related counts. 

● 

It is standardized; Cisco publishes values openly as a component of the draft RFC RTCP-HR (Real-Time 

Control Protocol - High Resolution): 

. 

● 

It can add CS and SCS across thousands of calls, for SLA. It does not over- or under-weight calls based on 

duration. 

● 

It is codec-independent. It reflects dynamic quality of transmission, not the codec baseline. 

SCSR grades calls with below-default configurable thresholds. 

Call Grading Guidelines 

<3% 

3%<=SCSR<=7% 

>7% 

<20% 

20%<=SCSR<=30% 

>30% 

Note that all audio quality metrics listed in Table 1 are stored in the CMR. For phones that do not generate CMR, 

such as Cisco TelePresence

®

 TC, CE, CTX, and IX endpoints; Jabber

®

 platforms (all platforms); Cisco IP 

Communicator; and Cisco Unified Personal Communicator, grading will be “N/A”. 

The Cisco Network Analysis Module (NAM) reports SCS as well. An audio stream reported from NAM will be 

graded based on SCSR, the same as an IP Phone. 

 

 

 

 

 

 

Printed in USA 

C11-735409-02  03/16