The following table has been used to initialize the participation roles registry.
+-----------------+---------+--------------------------+ | Role Type | Status | Reference | +-----------------+---------+--------------------------+ | CHAIR | Current | RFC 5545, Section 3.2.16 | | | | | | REQ-PARTICIPANT | Current | RFC 5545, Section 3.2.16 | | | | | | OPT-PARTICIPANT | Current | RFC 5545, Section 3.2.16 | | | | | | NON-PARTICIPANT | Current | RFC 5545, Section 3.2.16 | +-----------------+---------+--------------------------+