MTP 2 -> MTP 3
Sent to the application in response to a retrieve BSN status request. If there are no unacknowledged messages to be retrieved, MTP 2 also returns a status confirmation message in response to a retrieve messages status request. If there are unacknowledged messages to be retrieved, one or more data confirmation messages are returned to the application.
All other status requests are unconfirmed.
The following table lists the message parameters:
Type |
Field |
Description |
U8 |
Message Type |
0x79 |
S16 |
Service User ID |
Application reference number for the link from Bind request. |
S16 |
Action |
Action being reported in this confirmation. Possible values are: 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. |
U32 |
Status |
Current value of the backwards sequence number for the link when action = 1. |