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The performance of the self-service IP network has impact on the quality of the audio during calls. A busy network can delay or loose packets with audio information, causing poor audio performance. To help in troubleshooting such problems, you can set up the VoIP subsystem to send copies of RTCP packets to a VoIP Monitoring Manager (VMM), which is a call-quality monitoring application for calls that use packet-forwarding technology. VMM helps you to identify audio quality problems and take steps to resolve them.
