Association Control Service Element ACSE ISO 8649 ISO 8650 X.217 X.227 <networking> (ACSE) The {OSI} method for establishing a call between two {application programs}. ACSE checks the identities and contexts of the application entities, and could apply an {authentication} security check. Documents: {ITU} Rec. X.227 ({ISO} 8650), X.217 (ISO 8649) (1997-12-07)