18.104.22.168 OPEN Event
If the OPEN event is signaled, the RMS role MUST perform the following actions:
Set the value of the State field to OPENING.
Create a new CreateSequence message.
Set Inbound Sequence Identifier to the value of a new unique URI.
Set the Identifier element in the Offer element in the CreateSequence element in the body of the CreateSequence message to the value of Inbound Sequence Identifier.
Send the CreateSequence message on the underlying protocol.