C.2 Naming and Addressing Usage Rules
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## C.2 Naming and Addressing Usage Rules

DICOM Application Entity Titles are used in the Called/Calling Application Entity Title fields of the Upper Layer Service, in the Move Destination and Move Originator Application Entity Title data elements in the DICOM Message Command Set, and in various Attributes of the DICOM Message Data Set.

### Note

1. A single Application Entity Title can be associated with multiple network addresses assigned to a single system (e.g., multi-homed host).

2. A single Application Entity Title can be associated with multiple TCP Ports using the same or different IP Addresses.

3. A single network access point (IP Address and TCP Port) can support multiple Application Entity Titles.

A DICOM system on a network may support several application processes identified by different DICOM Application Entity Titles.

Upon receiving an association request, the Called Application Entity Title shall be validated so an association can be rejected when the corresponding local application does not exist.

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