Negotiating Modality in Real-Time Communications

Document Type Expired Internet-Draft (individual)
Author Gunnar Hellstrom 
Last updated 2017-12-12 (latest revision 2017-06-10)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


When negotiating language for a real-time session, users may have very specific preferences for using one modality (spoken, written or signed) over other possible but less preferred modalities. This specification introduces indication of modality preference to be used in session negotiation in combination with an earlier speified mechanism for language preference negotiation.


Gunnar Hellstrom (

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