Abstract: A method and apparatus enforcing and improving end-to-end service quality, based on end-to-end service performance characterization of network conditions, for a convergence enabled end-user device during a user session for service. The methods and apparatus provide end-to-end network monitoring by implementing a performance monitoring agent in the end user convergence enabled end-user device, as well as in network elements providing and controlling a session communications path for the convergence enabled end-user device, such as base stations, wireline points of presence, data centers, network operations centers, among other network elements (e.g., nodes and facilities).