3.2.5.5 Message Processing Events and Sequencing Rules

Unless explicitly specified in a message or PDU section, the messages and PDUs listed in this section correspond to events in the state diagram at the beginning of section 3.2.5.

All messages not specifically listed in this section, or messages whose syntax is specified in section 2 of this protocol as invalid, SHOULD be treated by implementations of this protocol on the server as protocol errors, as defined in section 3.2.5.5.13.