Status Message: In addition to the REQUIRED status code returned in every response, the response OPTIONALLY includes a "status- message" (text(255)) and/or a "detailed-status-message" (text(MAX)) operation attribute, as described in [RFC2911], sections 13 and 3.1.6.
The Printer can return any status codes defined in [RFC2911]. If the status code is not 'successful-xxx', the Printer MUST NOT return any Event Notification Attribute groups. The following are descriptions of the important status codes:
successful-ok: The response contains all Event Notification associated with the specified subscription-ids that had been supplied in the "notify-subscription-ids" operation attribute in the request. If the requested Subscription Objects have no associated Event Notification, the response MUST contain zero Event Notifications. successful-ok-events-complete: Indicates when this return is the last return for all Subscription objects that match the request, whether or not Event Notifications are returned. This condition occurs for Event Wait Mode with Notification Recipients waiting for responses when (1)