A user is experiencing high latency when connected to the company's VoIP system. The issue persists even when the network is not being heavily used by other applications or services. What is the BEST initial step to troubleshoot this network issue?
Completely redesign the network infrastructure to minimize bottlenecks.
Increase the bandwidth of the user's internet connection.
Ensure the latest version of antivirus software is installed on the user's device.
Check and configure Quality of Service (QoS) settings on switches and routers.