Diagram of an SCU-SCP Set-Up

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The diagram given below shows a simple example of an SCU-SCP connection and a series of function calls used to transfer messages and data.

SCU		SCP

L_DicomCreateNet	Create a DICOM Network handle.	L_DicomCreateNet
L_DicomStartUp	Initialize the DICOM Network handle.	L_DicomStartUp
L_DicomSetCallback	Set the callbacks to be used.	L_DicomSetCallback
	The SCP listens for incoming connection requests.	L_DicomListen
L_DicomConnect	--------------------------------------------------> The SCU calls this function to connect to an SCP. This generates a call to this callback function on the SCP	ACCEPTCALLBACK
CONNECTCALLBACK	<-------------------------------------------------- The SCP calls L_DicomCreateNet and L_DicomSetCallback for each connection it accepts. This provided the SCP memory to store information about this specific connection. L_DicomAccept is called to accept the connection. This generates a call to this callback function on the SCU.	L_DicomCreateNet L_DicomSetCallback L_DicomAccept
	DICOM Network Connection established
L_DicomSendAssociateRequest	--------------------------------------------------> The SCU calls this function to request a DICOM Associate connection. This generates calls to these callback functions on the SCP.	RECEIVECALLBACK RECEIVEASSOCIATEREQUESTCALLBACK
RECEIVECALLBACK RECEIVEASSOCIATEACCEPTCALLBACK or RECEIVECALLBACK RECEIVEASSOCIATEREJECTCALLBACK	<-------------------------------------------------- The SCP calls L_DicomSendAssociateAccept to accept the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEACCEPTCALLBACK on the SCU. L_DicomSendAssociateReject is sent to reject the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEREJECTCALLBACK on the SCU.	L_DicomSendAssociateAccept or L_DicomSendAssociateReject
	DICOM Associate Connection established
L_DicomSendCStoreRequest	--------------------------------------------------> The SCU calls this function to request the storage of data. This generates calls to these callback functions on the SCP.	RECEIVECALLBACK RECEIVEDATACALLBACK RECEIVECSTOREREQUESTCALLBACK
RECEIVECALLBACK RECEIVEDATACALLBACK RECEIVECSTORERESPONSECALLBACK	<-------------------------------------------------- The SCP calls this function to respond to the storage request. This generates calls to these callback functions on the SCU.	L_DicomSendCStoreResponse
L_DicomSendReleaseRequest or L_DicomSendAbort	--------------------------------------------------> The SCP calls L_DicomSendReleaseRequest to request a release from the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVERELEASEREQUESTCALLBACK on the SCP. This is the preferred method of closing a connection. L_DicomSendAbort can also be sent to close a connection. This generates calls to RECEIVECALLBACK and RECEIVEABORTCALLBACK on the SCP.	RECEIVECALLBACK RECEIVERELEASEREQUESTCALLBACK or RECEIVECALLBACK RECEIVEABORTCALLBACK
RECEIVECALLBACK RECEIVERELEASERESPONSECALLBACK	<-------------------------------------------------- The SCP calls this function to respond to the release request. This generates calls to the following callback functions on the SCU.	L_DicomSendReleaseResponse
L_DicomClose	---------------------------------------------------> The SCU calls this function to close the DICOM Associate connection. This generates a call to this callback function on the SCP.	CLOSECALLBACK