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Cisco Unified Communications Manager (CallManager)

Field Notice: FN - 62640 - CallManager CM 5.1.1.1000-7 Differentiated Services Code Point (DSCP) and Quality of Service (QoS) Values are Incorrect


January 5, 2007

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Product

CM QoS - 5.1

Problem Description

When CallManager 5.1.1.1000-7 Differentiated Services Code Point (DSCP) settings are set to enable, Quality of Service (QoS) prioritization for voice will not take effect. The result is poor voice quality when the network traffic is heavy.

Background

When a new installation of CallManager 5.1.1.1000-7 occurs, the DSCP and QoS values used for both Skinny (SCCP) signaling and Real-time Protocol (RTP) are incorrect.

The values in the actual packets coming from CallManager are incorrect for both SCCP and RTP, as well as the values the endpoints are instructed to use for RTP in the StartMediaTransmission messages.

Problem Symptoms

With both DSCP and QoS, packet markings are incorrect and invalid. Phones are receiving incorrect DSCP markings on Real-time Protocol (RTP) streams due to the value sent in the StartMediaTransmission message from CallManager.

Poor voice quality will result for users of CallManager 5.1.1.1000-7 on networks with heavy traffic.

Workaround/Solution

Upgrade to CallManager 5.1(1a).

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCsh23350 (registered customers only)

CM 5.1.1.1000-7 DSCP QoS values wrong - both pkts from CM and in SMT

Revision History

Revision

Date

Comment

1.0

05-JAN-2007

Initial Public Release

For More Information

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