CURRENT_MEETING_REPORT_ Reported by Ruth Lang/SRI International Minutes of the Multiparty Multimedia Session Control Working Group (MMUSIC) An on-line copy of the minutes and the accompanying PostScript slides are available from ftp://ftp.isi.edu/confctrl/minutes in the files ietf.4.95 and slides.4.95.tar. The Multiparty Multimedia Session Control Working Group (MMUSIC) met for two sessions (one planned and one impromptu) on 5 April at the 32nd IETF. Revised Working Group Charter Ruth Lang gave an overview of the revised working group charter (slides.4.95.a). The new charter provides a more balanced focus on the range of conferencing styles, motivates the development of solutions for loosely-controlled conferences, and encourages identification of interoperability issues with related international/consortium standards efforts. New goals and milestones were reviewed. No comments on the revision were received during the meeting, but were requested to be sent to the mailing list, confctrl@isi.edu. The revised charter will be sent for review by the Transport Area Director and subsequent submission to the IESG in April. The Agreement Protocol Abel Weinrib presented an update on the Agreement Protocol. A document in Internet-Draft format describing the protocol was circulated to the list. After some formatting issues have been addressed, it will be submitted as an Internet-Draft. Ted Ko, who described his implementation of the Agreement Protocol at the MMUSIC meeting during the 31st IETF, has not made progress toward making this implementation available, or on writing an associated usage document. Abel will encourage progress on both and report status to the mailing list. The Personal Conferencing Specification Abel Weinrib gave an overview of the Personal Conferencing Specification. Recently the Personal Conferencing Working Group announced intention to include H.32Z.2 and H.261 in the specification. The latter signals a move away from exclusive inclusion of a proprietary video encoding technology. H.32Z.2, which describes visual telephone systems and terminal equipment, is focused on LAN transport but as indicated by the editor of H22Z, there may be some overlap between it and RTP. The Session Description Protocol Mark Handley (slides.4.95.b) provided an overview and in-depth discussion of the Session Description Protocol (SDP). A continuation of this discussion was the subject of the afternoon MMUSIC session. Constructive comments and discussion resulted in about a dozen issues that Mark and Van will address. Some suggested changes which are consistent with the general design goals encouraged further departure from SDPv1 format (e.g., move start/stop times from conference data to repeat time field). Some issues were left as outstanding and will be discussed on the mailing list (e.g., IPv4 vs IPv6 address formats in the SDP header vs. removing the field altogether as redundant with the originating host field). Mark Handley will circulate a detailed list of suggested changes and outstanding issues to the mailing list. A revised Internet-Draft has been targeted for resubmission in June. A Local Conference Control Architecture Henning Schulzrinne (slides.4.95.c) described a local conference control architecture which includes a message replicator, media agents, and conference controllers. The message replicator provides content-based filtering and a lower-overhead alternative to local multicast distribution of control messages. He described an ASCII control message protocol which uses hierarchical descriptors to name conference components (similar to CCCP). Relationship Between RTCP and Session Management Protocols Steve Casner (slides.4.95.d) provided a brief overview of the distribution of control functions with respect to RTP/RTCP. He described a control issue raised on the rem-conf mailing list (error reporting), and two approaches and their tradeoffs to providing additional control functionality distribution: adding application specific control messages to RTCP, and placing needed functionality in another session control protocol. Due to lack of time, no discussion on this topic occurred but is expected to continue on rem-conf. An Application to Create Point-to-Point Conferences Vinay Kumar described an application he has developed which uses MIME e-mail and WWW to create point-to-point conferences using MBONE tools. Use of e-mail as an invitation/rendezvous mechanism met Vinay's goals of providing non-intrusive rendezvous. Bill Fenner suggested that ``sd_launch'' could be used by Vinay's tool to support the creation of multiparty conferences. Interoperability Usage Scenarios In addition to actions implied by the goals and milestones in the charter, the goal of developing interoperability usage scenarios (MMUSIC protocols with industry/international consortium standards) was identified. Carsten Bormann and Joerg Ott will lead this effort.