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Instance notion A conference MCU (mixer) “works with” a particular state document for an active conference It doesn’t care that there are other documents These other (latent) documents can be manipulated via the conference control protocol, via the hierarchy (affecting one, some or all) Single active instance for each conference Focus URI can be specific or generic – it’s inherited like other parameters an instance can have multiple URIs (e.g., tel:, h323: or sip:) Focus URI can be disambiguated by time, caller, etc. |