WAP-206-MMS Client Transactions.

On Section 7.2.1:

Upon receipt of the Notification.ind message, the MMS Client SHALL respond by invoking a WSP/HTTP POST POST operation with an M-NotifyResp.ind message embedded as the content body. This message is submitted using a URI that addresses the MMS Proxy -Relay that supports the specific MMS Client. The MMS Client SHOULD ignore the associated WSP/HTTP POST POST response from the MMS Proxy -Relay.

My question is: If the M-Notification.ind is sent via an SMS bearer ( e.g.: a Push via a binary SMS ), how ans where to does the MMS client respond with the M-NotifyResp.ind when the M-Notification.ind did not come from an MM Proxy/Relay but from an SMSC?