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All IPPM QoS parameter metrics are defined for end-to-end one-way measurement These metrics provide exact indicators of network layer quality in the pair communications. However, further attention should be put on the multiparty communications, which might use multicast routing protocols, e.g., the IP conferencing services, online gaming, online stock market and etc. To qualify the multiparty communications, the future QoS study and metrics are required to be defined. The purpose of this paper is to highlight the new QoS requirements of the multiparty communication services in terms of relative delay, relative jitter and relative packet loss. A set of parameter metrics is derived from the existing one-way metrics in IP performance metrics (IPPM) for the multiparty communications to present these new requirements. These parameter metrics are supposed to provide methods and rules for engineers to measure and judge the QoS of the multiparty communications.