Obviously everyone wants their calls to be the very best quality possible. Before we delve into the detail of how you can achieve this, it's first important that you understand something called Quality of Service. This video will explain all you need to know, then below are listed the steps you'd need to take to get this set up on your network.
If your router doesn't support QoS then we'd highly recommend that you invest in a new router. We recommend the Draytek Vigor2862 Series routers and provide detailed instructions on how they can be set up with CircleLoop.