> The way QoS works for VoLTE for example, is not by putting application layer knowledge at the link layer. Instead the services that activate and route a phone

> The way QoS works for VoLTE for example, is not by putting application layer knowledge at the link layer. Instead the services that activate and route a phone call, have the ability to send a rule, called a traffic flow template, to the underlying LTE network. So you need to put link-layer knowledge in the application layer, and on anything in between the app and the network link. Your app needs some API to do this, and it surely isn't a transparent connect(2). And if you want full support, then when hook up your LTE access point to a consumer-grade wifi-router — or maybe your business's router, as a backup if the primary link fails — you'll need some way to relay support there as well, and to your desktop software running Windows, and to OSX and Linux, and your Docker container. It's all doable, it's just a massive amount of coordination in exactly the way "throw me some packets!" isn't.