210-060 · Question #351
An engineer is troubleshooting call quality issues between two sites. On an active voice call, the call statistics on the IP phone show that the max jitter is 100 ms. What is the maximum amount of…
The correct answer is C. 30 ms. VoIP quality standards define 30ms as the maximum acceptable one-way jitter for high-quality audio. The observed 100ms jitter far exceeds this threshold, confirming a quality problem.
Question
An engineer is troubleshooting call quality issues between two sites. On an active voice call, the call statistics on the IP phone show that the max jitter is 100 ms. What is the maximum amount of jitter that the engineer can allow and still expect to maintain a high-quality audio call?
Options
- A5 ms
- B10 ms
- C30 ms
- D50 ms
How the community answered
(32 responses)- A3% (1)
- B3% (1)
- C94% (30)
Why each option
VoIP quality standards define 30ms as the maximum acceptable one-way jitter for high-quality audio. The observed 100ms jitter far exceeds this threshold, confirming a quality problem.
5ms represents near-ideal network conditions, not the maximum allowable threshold - this value is far too strict to be the industry standard ceiling.
10ms is below the accepted maximum of 30ms; while lower jitter is better, the standard does not require values this low to achieve high-quality audio.
Cisco and ITU-T G.114 voice quality guidelines specify that jitter must not exceed 30ms to maintain high-quality audio. Values above this threshold cause playout buffer overflow, packet reordering, and audible distortion. The current 100ms reading indicates the call is well outside acceptable parameters.
50ms exceeds the 30ms maximum jitter threshold and would result in noticeable call quality degradation, making it an unacceptable upper limit.
Concept tested: VoIP jitter threshold for high-quality audio
Source: https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bpvvid.html
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