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Market / Technical Needs High Level Protocol for Creating of Rich, Real-Time Interactive Multimedia Applications Rules Out H.248 Stimulus Markup Model Leads to SIP For Session Initiation(draft-ietf-sipping-app-interaction-framework-05) Conference/Mixing Control VoiceXML Excellent for User Interfaces VoiceXML, By Design, Does Not Help for Conference Control / Topology (Level Below XCON) Need Protocol and Markup for Conference Control and Light IVR for Audio / Video Media Servers |