210-060 · Question #287
All 50 employees in a company have Cisco IP phones. One employee notices high latency (more than 250 ms one way) on the IP network. How might this latency impact the employees when they try to make…
The correct answer is D. The conversation has delays and interruptions. One-way latency exceeding 250 ms causes perceptible conversation delays, making normal dialogue difficult as parties unknowingly talk over each other.
Question
All 50 employees in a company have Cisco IP phones. One employee notices high latency (more than 250 ms one way) on the IP network. How might this latency impact the employees when they try to make an outgoing phone call?
Options
- AThe voice quality cuts in and out
- BThe call fails with a busy signal
- CThe voice quality sounds like it is under water
- DThe conversation has delays and interruptions
How the community answered
(30 responses)- A3% (1)
- B3% (1)
- D93% (28)
Why each option
One-way latency exceeding 250 ms causes perceptible conversation delays, making normal dialogue difficult as parties unknowingly talk over each other.
Audio cutting in and out is characteristic of high packet loss or severe jitter, not the effect of high latency alone.
A busy signal indicates call signaling failure or resource exhaustion at the network or switch level, not a symptom produced by network latency.
An underwater or muffled audio quality is typically caused by codec misconfiguration, excessive jitter, or packet reordering - not high one-way latency.
One-way latency above 250 ms creates a noticeable delay between when a speaker talks and when the listener hears the audio, resulting in awkward pauses and interruptions as both parties attempt to respond simultaneously. This is a direct effect of excessive end-to-end transmission delay and is distinct from audio quality degradation caused by packet loss or jitter.
Concept tested: VoIP one-way latency impact on voice call quality
Source: https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/14081-voip-qos.html
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