DICOM PS3.8 2018b - Network Communication Support for Message Exchange

7.2 A-RELEASE Service
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## 7.2 A-RELEASE Service

The graceful release of an association between two AEs shall be performed through ACSE A-RELEASE request, indication, response, and confirmation primitives. The initiator of the service is hereafter called a requestor and the service-user that receives the A-RELEASE indication is hereafter called the acceptor. It shall be a confirmed service.

Figure 7-2 illustrates the graceful release of an association between two AEs.

Figure 7-2. Association Release

### 7.2.1 A-RELEASE Parameters

Table 7-4 lists the parameters for the A-RELEASE service that shall contain fixed values or shall not be used by DICOM Application Entities in this standard.

Table 7-4. A-RELEASE Service Parameters

A-RELEASE parameter name | Request | Indication | Response | Confirmation
--- | --- | --- | --- | ---
reason | UF | UF(=) | UF | UF(=)
user information | NU | NU(=) | NU | NU(=)
result |  |  | MF | MF(=)

#### 7.2.1.1 Reason (Fixed)

When used on the request primitive, this parameter identifies the general level of urgency of the request. This parameter shall always use the value "normal" in this standard.

#### 7.2.1.2 Result (Fixed)

This parameter shall always take the value "affirmative" in this standard.

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DICOM PS3.8 2018b - Network Communication Support for Message Exchange