What does "Quality of Service" (QoS) in IP telephony ensure?

"Quality of Service" (QoS) in IP telephony is crucial for ensuring that voice communication maintains a high level of quality during transmission. This is particularly important because voice data is sensitive to delays, packet loss, and jitter, which can significantly degrade call quality. QoS mechanisms prioritize voice traffic over other types of data to provide a clear and consistent audio experience for users.

By managing bandwidth allocation and ensuring that voice packets receive priority, QoS helps to maintain clarity during calls, reduce unwanted interruptions, and ensure that calls are stable even when the network is congested. Thus, the ability of voice communication to sustain high-quality transmission is fundamentally what QoS aims to achieve in an IP telephony environment.