CSTA-message-waiting-event { iso( 1) identified-organization( 3) icd-ecma( 12) standard( 0) csta3( 285) message-waiting-event( 44) } DEFINITIONS ::= BEGIN IMPORTS -- Data Types -- DeviceID, SubjectDeviceID FROM CSTA-device-identifiers { iso( 1) identified-organization( 3) icd-ecma( 12) standard( 0) csta3( 285) device-identifiers( 123) } CSTACommonArguments FROM CSTA-extension-types { iso( 1) identified-organization( 3) icd-ecma( 12) standard( 0) csta3( 285) extension-types( 129) }; MessageWaitingEvent ::= SEQUENCE { targetDevice SubjectDeviceID, deviceForMessage DeviceID OPTIONAL, messageWaitingOn BOOLEAN, extensions CSTACommonArguments OPTIONAL } END -- of CSTA-message-waiting-event