3.2.3.5.9 Echo Request PDU

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An inbound proxy implementation MUST NOT accept the Echo Request PDU in any state other than Open_Start. If received in any other state, this PDU is a protocol error and the inbound proxy implementation MUST treat it as a protocol error as specified in section 3.2.3.5.10.

If this PDU is received in an Open_Start state, then the inbound proxy implementation MUST perform the following actions in the sequence given:

  • Send an Echo Response PDU to the client.

  • Transition to the Finished state.