Example Concept: Quality of Service (QoS) for VoIP involves classifying and marking voice traffic with higher priority using DSCP (Differentiated Services Code Point) values, such as EF (Expedited Forwarding). Network devices then use these markings to prioritize voice packets over other types of traffic, employing queuing mechanisms like Low Latency Queuing (LLQ) to ensure timely delivery. This reduces latency and jitter, improving call quality even during network congestion.