Quality of Service markings can benefit real time traffic. A survey we conducted on a mobile cellular testbed (Monroe) has revealed how differentiated services traffic is treated in practical networks, and shows many networks do not respect diffserv markings resulting unpredictable real-time performance.

This motivates a change to the network programming API for real-time traffic to provide dynamic transport selection and fallback, enabling successful use of network QoS. The API is presented in the context of the NEAT1 open source project.