When answering this question, focus on the key techniques and technologies used to ensure QoS in VoIP networks. Start by explaining what QoS is and why it is critical in VoIP systems. Mention specific methods such as traffic prioritization, bandwidth management, and jitter buffering. Provide examples of protocols and tools like DiffServ, MPLS, and RTP that are commonly used. Discuss any relevant experience you have with implementing these techniques in real-world scenarios. For example:
"Quality of Service (QoS) is essential in VoIP networks to ensure clear and uninterrupted voice communication. To achieve this, I prioritize VoIP traffic over less critical data traffic using techniques like DiffServ and MPLS. I also manage bandwidth to prevent congestion and use jitter buffers to handle packet delay variations. In my previous role, I implemented these methods to maintain high-quality voice calls even during peak usage times."
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