Field Notice: FN - 70215 - VVB on KVM Plays Distorted Audio Using VXML Application While Recording - Software Upgrade Recommended

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Updated:June 7, 2018
Document ID:FN70215

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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.

Revision History

Revision Publish Date Comments
1.0
07-Jun-18
Initial Release

Products Affected

Affected OS Type Affected Release Affected Release Number Comments
NON-IOS
VVB 11
11.6(1)

Defect Information

Defect ID Headline
CSCvi56863 VVB is playing back distorted audio from VXML application- Applicable only to KVM VVB

Problem Description

The recorded audio quality is distorted on a Cisco Virtualized Voice Browser (VVB) that runs on a Kernel-based Virtual Machine (KVM) (Integrated Services Router gateways) for VoiceXML (VXML) based recording.

Background

The network driver adapter (Virtual I/O Device (VIRTIO)) used in an existing Open Virtual Appliance (OVA) image causes audio distortion.

Problem Symptom

When a recorded audio file is played back with VVB VXML record functionality, the audio quality of recorded media is not played as recorded.

In order to check the network driver adapter, complete these steps:

  1. Enter the show virtual-service tech-support command on the router console.
  2. Look for the "-device virtio" keyword for the container VVB instance.

Workaround/Solution

Download and deploy a new OVA image with network driver adapter E1000.

In order to verify the network driver adapter changes, complete these steps:

  1. Enter the show virtual-service tech-support command on the router console.
  2. Look for the “-device e1000” keyword for the container VVB instance.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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