The Application Context Name structure is based on the OSI Object Identification (numeric form) as defined by ISO 8824. Application Context Names are registered values as defined by ISO 9834-1 to ensure global uniqueness. They are encoded as defined in Annex F when the TCP/IP network communication support is used as defined in Section 9.
The organization responsible for the definition and registration of DICOM Application Context Names is NEMA. NEMA guarantees uniqueness for all DICOM Application Context Names. A choice of DICOM registered Application Context Names related to the DICOM Application Entities, as well as the associated negotiation rules, are defined in PS 3.7.