This Recommendation | International Standard describes quality of service (QoS) management functions for the n-plex multicast transport over Internet where IP multicast is supported. Quality of service (QoS) management functions such as QoS negotiation, monitoring and maintenance features are specified. Protocol details such as packet format, parameter values and procedures are described. This protocol can be used for applications that require many-to-many data delivery service with QoS managing facility; the protocol is expected to provide transport service to multimedia conference service over IP multicast, etc.