M2PA: BSN processing when FSN out of order

"Davidson, Mark" <[email protected]>
Newsgroups gmane.ietf.sigtran
Message-ID <[email protected]>
"If M2PA receives a User Data message with an FSN that is out of order,
M2PA SHALL discard the message."
 
Should the BSN be processed when this occurs, as it would if it were a
retransmitted MSU in SS7?
 
Why does the above requirement exist if M2PA does not retransmit?
 
"Note that since SCTP provides reliable delivery and ordered delivery
within the stream, M2PA does not perform retransmissions."

 
-Mark Davidson

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