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Session Initiation Protocol seems to be the preferred standardfor Voice over IP. In this paper, we consider the limitationsof existing SIP conferencing methods and propose a distributedarchitecture using Controllers (SIP Proxy Servers) andConference Servers which facilitates the control and mediahandling of a VoIP conference. The Conference Servers aredesigned on the basis of H.323's Multipoint Processors andhandle the audio part of the conference. We provide confereningmessages on SIP that bring these Controllers and ConferenceServers together along with the Clients for scalable conferenceon the Internet. The schematic of the Proxy Server andConference Server is presented to aid in implementation. Wealso explain the mechanism we use to improve the quality ofmixed output speech by selecting the streams at the Clients.