A user in location X dials an extension at location Y. The call travels through a QoS-enabled WAN network, but the user experiences choppy or clipped audio. What is the cause of this issue?

The correct answer is A. missing Call Admission Control. Choppy or clipped audio on a QoS-enabled WAN indicates that too many concurrent calls are consuming available bandwidth, causing voice packets to be dropped or delayed despite QoS markings. Call Admission Control (CAC) prevents over-subscription by limiting the number of simultan

Cisco Unified Communications Manager Call Control

Question

A user in location X dials an extension at location Y. The call travels through a QoS-enabled WAN network, but the user experiences choppy or clipped audio. What is the cause of this issue?

Options

Amissing Call Admission Control
Bcodec mismatch
Cptime mismatch
Dphone class of service issue

How the community answered

(24 responses)

A
71% (17)
B
8% (2)
C
4% (1)
D
17% (4)

Explanation

Choppy or clipped audio on a QoS-enabled WAN indicates that too many concurrent calls are consuming available bandwidth, causing voice packets to be dropped or delayed despite QoS markings. Call Admission Control (CAC) prevents over-subscription by limiting the number of simultaneous calls allowed over a link. Without CAC, even a properly configured QoS policy can be overwhelmed. A codec mismatch would typically result in no audio or a failed call, not clipping. A ptime mismatch affects packetization intervals but rarely causes clipping. A CoS issue would affect prioritization, but since QoS is stated to be enabled, this is not the root cause.

Topics

#Call Admission Control (CAC)#Voice Quality#WAN QoS#VoIP Troubleshooting

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