Network Management

Unable to see quality data for calls in VNQM

VNQM polls CMRs (Call Management Records) for the call quality details. These details are provided by both endpoints that are involved in a call. Therefore, you can have up to two CMRs for a call: one describing the source endpoint connection quality, and the other describing the destination endpoint connection quality. In some cases, you will not be able to see call quality data for one or both endpoints.

First published date

11/19/2018 5:59 PM

Last published date

8/30/2022 12:20 PM

Overview

VNQM polls two types of call details:
 

  • CDRs (Call Detail Records) contain information about the call source and destination.

  • CMRs (Call Management Records) contain the call quality details. These details are provided by both endpoints that are involved in a call. Therefore, you can have up to two CMRs for a call: one describing the source endpoint connection quality, and the other describing the destination endpoint connection quality.


In some cases, you will not be able to see call quality data for one or both endpoints.

Product section

VoIP & Network Quality Manager

Cause

H323 and SIP (pre CUCM 12.5) devices do not support CMRs

Resolution

To see the quality data, you need to have a device that supports CMRs:
 

  • MGCP and SCCP devices typically support CMRs. For these endpoints, you can see the appropriate quality metric values in VNQM.

  • H323 and SIP (pre CUCM 12.5) devices do not support CMRs. For these endpoints, you'll see the label "unsupported".


So, if one endpoint call supports CMRs and the other doesn't, you'll be able to see only one CMR.