3.1.7.3 PREPARE_ACKNOWLEDGEMENT Event
This event MUST be signaled with the following argument:
Request: A request message.
If PREPARE_ACKNOWLEDGEMENT is signaled, the RMS role MUST perform the following actions:
Set the value of the Identifier element in the SequenceAcknowledgement block in the headers element of the request to the value of the Inbound Sequence Identifier field.
Add the sequence numbers in the Response Sequence Number List to the SequenceAcknowledgement header block in the Header element of the Response by adding Acknowledgement Range elements as specified in [WSRM1-0] section 3.2 or [WSRM1-1] section 3.9.