This Recommendation addresses end-to-end Quality of Service (QoS) information collection, aggregation and exchange between Service Customers, Service Providers and Network Operators. In the context of this Recommendation, Service Providers (SPs) include Telecom SPs, Internet SPs, Application SPs and Content SPs. Service Customers include end-Customers and other SPs. Functions and interfaces required to ensure end-to-end QoS classes are specified for the complete service life cycle.