Exam 300-080 Question id=4131 Troubleshoot Call Quality Issues

After you deploy a new Cisco Collaboration solution, users report echoes and choppy voice quality. Which two actions correct the problem?

A. Upgrade the Cisco IOS version and flash memory on the Cisco IOS router.
B. Deploy additional hardware resources.
C. Deploy an echo canceller.
D. Upgrade Cisco Unified Communications Manager.
E. Enable QoS on the network.

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