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Media Tag Document Callee caps today allows you to register capabilities for different streaming media types Audio, video, application, message, data All of the SDP m=values If you do ‘audio’, asking to reach a UA that also does ‘audio’ means you are likely to be able to do audio together NOT true for ‘application’ – real semantic is in the next layer type Media tag document proposes media feature tag for contact header field that conveys application sub-type supported for streaming media i.e., “Doom game move protocol” |