Аннотация:In previous work we developed an approach to spoken Russian monologic discourse. In this paper we extend that approach, looking primarily at interactional multi-party discourse and placing the speech phenomena in the context of multichannel (multimodal) communication. The evidence analysed is the Russian Pear Chats and Stories corpus, see http://multidiscourse.ru/. Scores transcripts are introduced to annotate the interlocutors’ shared time line, including periods of silence. Elementary discourse unit (EDU) is posited as a central building block of local discourse structure. Canonical EDUs coincide with clauses; in addition, subclausal, superclausal and paraclausal EDUs are found. A variety of prosodic phenomena are considered, in the first place the discourse accent. A discourse-semantic category of phase is used to account for relationships between EDUs and groups of EDUs. Disfluencies and other structural phenomena are treated in a systematic way. Conventions of discourse transcription are explained in detail, capturing both prosodic and functional aspects of discourse.