Notifier generation of Notify requests

If the notifier expects the setting of marks in the HLR to take more than 200 ms, it MUST send a 202 response to the SUBSCRIBE request immediately, accepting the subscription. It should then send a NOTIFY request with an empty body. This NOTIFY request MUST have a "Subscription-State" header with a value of "pending".

This immediate NOTIFY with an empty body is needed since the resource identified in the SUBSCRIBE request does not have as yet a meaningful state.

Once the notifier has successfully interfaced with the SCF, it MUST send a subsequent NOTIFY request with an empty body and a "Subscription-State" header with a value of "active."

When the event of interest identified in the SUBSCRIBE request occurs, the notifier sends out a new NOTIFY request which MUST contain a body as described in Section 6.7.

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