The Journal of Multimodal User Interfaces (JMUI) publishes multidisciplinary research on the design, implementation, and evaluation of multimodal interfaces and interactions, spanning Human-Computer Interaction, signal processing, cognitive science and ergonomics: https://link.springer.com/journal/12193 Based on the W3C Workshop "Smart Voice Agents" (Feb 2026), which identified a critical need to move beyond proprietary, fragmented voice ecosystems toward interoperable, real-time, and inclusive systems, JMUI invites submissions to its Special Issue addressing these gaps through new protocols, architectural approaches and inclusive design. The papers can be short or long 8-12 pages, focussing on the Top 8 Cross-cutting Issues & key themes identified by the workshop community: - Real-time Interaction and Natural Turn-taking: Research into incremental, word-level processing to enable responsive interruption handling & low-latency feedback - Interoperability and Multiagent Protocols: Standards for agent-to-agent communication, conversation handoff, and shared context, e.g., the Open Floor Protocol - VoiceFirst Web Accessibility: Leveraging LLM reasoning and embeddable agents to bridge the gap between visual interfaces & non-visual access, moving beyond traditional screen readers - Multimodal Coordination and Grounding: Fusing voice with gaze tracking, gestures and non-verbal cues to improve intent resolution & trust - Reliability and Hallucination Control: Shared benchmarks & evaluation methods for ASR & LLM error modes in noisy or high-stakes environments like healthcare - Accessibility for Immersive Content: Standardizing semantic 3D metadata & voice spatial cues for immersive/XR environments - Pronunciation and Language Representation: Standards for phonetic markup (e.g., SSML in HTML) to ensure consistent pronunciation across assistive technologies - Privacy, Trust, and Delegation: Frameworks for user consent, privacy-preserving identity assertions, and auditable agent actions taken on behalf of users. Authors must follow the Springer JMUI instructions: Submission guidelines | Journal on Multimodal User Interfaces | Springer Nature Link<https://link.springer.com/journal/12193/submission-guidelines?IFA> and submit on: https://link.springer.com/journal/12193 During the submission process, select the article type “Smart Voice (SVA-2026)” Submission Deadline: October 15, 2026 More information: https://sites.google.com/view/smartvoiceagents/start-page or contact the guest editors: Deborah Dahl, Dirk Schnelle-Walka, Gérard Chollet, Kristiina Jokinen