This Recommendation defines the requirements and functionality needed to support Quality of Service (QoS) within the IPCablecom2 Architecture. It is an important objective of this work that interoperability between IPCablecom 2.0 and 3GPP IMS is provided. IPCablecom 2.0 is based upon 3GPP IMS@ but includes additional functionality necessary to meet the requirements of cable operators. Recognizing developing converged solutions for wireless@ wireline@ and cable@ it is expected that further development of IPCablecom 2.0 will continue to monitor and contribute to IMS developments in 3GPP@ with the aim of alignment of 3GPP IMS and IPCablecom 2.0. NOTE ?C The structure and content of this Recommendation have been organized for ease of use by those familiar with the original source material; as such@ the usual style of ITU-T recommendations has not been applied.