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This section specifies an SDP extension to allow a user agent to declare in an SDP offer or SDP answer MSI. An MSI represents a contributing source (CSRC) and replaces the use of an SSRC value in a CSRC list. An MSI is allocated for a media stream by an MCU and given to a conference client using an a=x-source-streamid attribute. For additional information about MSI, refer to [MS-RTP] section 2.2.10.