2.2.10 RTCP SDES
The RTCP SDES packets are as specified in [RFC3550] section 6.5, with the exception that all text is null terminated, except for SDES PRIV fields.
This protocol differs from [RFC3550] in the value of the CSRC field in the SDES chunk. When a mixer uses this protocol to send SDES for contributing sources, the CSRC field in the SDES chunk is the MSI instead of SSRC from the contributing sources.