9.3.5.2 C-ECHO-RSP
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#### 9.3.5.2 C-ECHO-RSP

The C-ECHO-RSP Message contains fields as defined in Table 9.3-13 and in Annex C. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the C-ECHO service definition unless otherwise noted in Table 9.3-13. Fields not specified in the C-ECHO service definition but present in Table 9.3-13 are required by the DIMSE-C protocol.

Table 9.3-13. C-ECHO-RSP Message Fields

Message Field | Tag | VR | VM | Description of Field
--- | --- | --- | --- | ---
Command Group Length | (0000,0000) | UL | 1 | The even number of bytes from the end of the value field to the beginning of the next group.
Affected SOP Class UID | (0000,0002) | UI | 1 | SOP Class UID associated with the operation.
Command Field | (0000,0100) | US | 1 | This field distinguishes the DIMSE‑C operation conveyed by this Message. The value of this field shall be set to 8030H for the C-ECHO-RSP Message.
Message ID Being Responded To | (0000,0120) | US | 1 | Shall be set to the value of the Message ID (0000,0110) field used in associated C-ECHO-RQ Message.
Command Data Set Type | (0000,0800) | US | 1 | This field indicates that no Data Set is present in the Message and shall be set to a value of 0101H.
Status | (0000,0900) | US | 1 | Indicates the status of the response. It shall have a value of Success.

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