The following table has been used to initialize the actions registry.
+-----------+------------+----------------------------+ | Action | Status | Reference | +-----------+------------+----------------------------+ | AUDIO | Current | RFC 5545, Section 3.8.6.1 | | | | | | DISPLAY | Current | RFC 5545, Section 3.8.6.1 | | | | | | EMAIL | Current | RFC 5545, Section 3.8.6.1 | | | | | | PROCEDURE | Deprecated | [RFC2445], Section 4.8.6.1 | +-----------+------------+----------------------------+