The following C-ECHO procedures apply:
a) The invoking DIMSE-service-user requests verification of communication to the performing DIMSE-service-user by issuing a C-ECHO request primitive to the DIMSE-service-provider.
b) The DIMSE-service-provider issues a C-ECHO indication primitive to the performing DIMSE-service-user.
c) The performing DIMSE-service-user verifies communication by issuing a C-ECHO response primitive to the DIMSE-service-provider.
d) The DIMSE-service-provider issues a C-ECHO confirmation primitive to the invoking DIMSE-service-user, completing the C-ECHO operation.