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3.1.5.32.2 User agent behavior for a=x-source-streamid attribute

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When allocating an m=audio or m=video media stream, a MCU user agent SHOULD<59> allocate an appropriate MSI and provide the MSI of the media stream to the client using the a=x-source-streamid attribute. The MSI value allocated by the MCU MUST be unique within the conference.

An MCU user agent SHOULD ignore a a=x-source-streamid attribute in an SDP message received from a conference participant.