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Status Confirmation

Direction

MTP 2 -> Layer 3

Description

The STATUS CONFIRMATION is sent to the application in response to a "retrieve BSN" status request. MTP 2 may also return a STATUS CONFIRM message in response to a "retrieve messages" status request, but only if there are no unacknowledged messages to be retrieved. If there are unacknowledged messages to be retrieved, one or more DATA CONFIRM messages are returned to the application instead.

All other status requests are unconfirmed.

Format
Service User ID Application's reference number for this link (from BIND REQUEST)

Action The action being reported in this confirmation:


   1  Response to retrieve backwards
      sequence number status request;
      Status field contains BSN.
   3  Response to retrieve messages status
      request; no unacknowledged messages to
      retrieve
Status The current value of the backwards sequence number for this link when Action = 1.


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