D.4.2 AE Specifications
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### D.4.2 AE Specifications

#### D.4.2.1 ECHO-SCP

##### D.4.2.1.1 SOP Classes

ECHO-SCP provide Standard Conformance to the following SOP Class(es) :

Table D.4.2-1. SOP Classes Supported By ECHO-SCP

SOP Class Name | SOP Class UID | SCU | SCP
--- | --- | --- | ---
Verification SOP Class | 1.2.840.10008.1.1 | No | Yes

##### D.4.2.1.2 Association Policies

###### D.4.2.1.2.1 General

ECHO-SCP accepts but never initiates associations.

Table D.4.2-2. Maximum PDU Size Received as a SCP for ECHO-SCP

Maximum PDU size received | Unlimited

###### D.4.2.1.2.2 Number of Associations

Table D.4.2-3. Number of Associations as a SCP for ECHO-SCP

Maximum number of simultaneous associations | Unlimited

###### D.4.2.1.2.3 Asynchronous Nature

ECHO-SCP will only allow a single outstanding operation on an Association. Therefore, ECHO-SCP will not perform asynchronous operations window negotiation.

###### D.4.2.1.2.4 Implementation Identifying Information

Table D.4.2-4. DICOM Implementation Class and Version for ECHO-SCP

Implementation Class UID | xxxxxxxxxxx.yy.etc.ad.inf.usw
Implementation Version Name | Viewer1.0

##### D.4.2.1.3 Association Initiation Policy

ECHO-SCP does not initiate associations.

##### D.4.2.1.4 Association Acceptance Policy

When ECHO-SCP accepts an association, it will respond to echo requests. If the Called AE Title does not match the pre-configured AE Title shared by all the SCPs of the application, the association will be rejected.

###### D.4.2.1.4.1 Activity- Receive Echo Request

###### D.4.2.1.4.1.1 Description and Sequencing of Activities

###### D.4.2.1.4.1.2 Accepted Presentation Contexts

Table D.4.2-5. Acceptable Presentation Contexts for ECHO-SCP and Receive Echo Request

Presentation Context Table
Abstract Syntax | Transfer Syntax | Role | Extended Negotiation
--- | --- | --- | ---
Name | UID | Name List | UID List
Verification | 1.2.840.10008.1.1 | Implicit VR Little Endian | 1.2.840.10008.1.2 | SCP | None
Explicit VR Little Endian | 1.2.840.10008.1.2.1
Explicit VR Big Endian | 1.2.840.10008.1.2.2

###### D.4.2.1.4.1.2.1 Extended Negotiation

No extended negotiation is performed.

###### D.4.2.1.4.1.3 SOP Specific Conformance

###### D.4.2.1.4.1.3.1 SOP Specific Conformance to Verification SOP Class

ECHO-SCP provides standard conformance to the Verification Service Class.

###### D.4.2.1.4.1.3.2 Presentation Context Acceptance Criterion

ECHO-SCP will always accept any Presentation Context for the supported SOP Classes with the supported Transfer Syntaxes. More than one proposed Presentation Context will be accepted for the same Abstract Syntax if the Transfer Syntax is supported, whether or not it is the same as another Presentation Context.

###### D.4.2.1.4.1.3.3 Transfer Syntax Selection Policies

ECHO-SCP prefers explicit Transfer Syntaxes. If offered a choice of Transfer Syntaxes in a Presentation Context, it will apply the following priority to the choice of Transfer Syntax:

1. first encountered explicit Transfer Syntax,

2. default Transfer Syntax.

ECHO-SCP will accept duplicate Presentation Contexts, that is, if it is offered multiple Presentation Contexts, each of which offers acceptable Transfer Syntaxes, it will accept all Presentation Contexts, applying the same priority for selecting a Transfer Syntax for each.

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