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The paper investigates an approach to exchange quality of service information across the layers between third party applications and network functions for bearer resource management. The focus is on Parlay X Web Services which may be used to access functions for policy and charging control in all IP-based multimedia networks. A functional mapping of Parlay X interfaces onto network control protocol is suggested. The Parlay X Gateway utilization is evaluated taking into account as its distributed architecture, as the processing of both requests and notifications of events, concerning QoS management.