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If a not fully sent message is abandoned, there must be a TSN representing the end of that message (even if that fragment is never sent), as the receiver can otherwise reject the next sent message as it hasn't seen any end of the previous one. A long explanation can be found at https://github.com/sctplab/usrsctp/issues/592#issuecomment-849047689 Bug: webrtc:12812 Change-Id: I09c571bd6dd2774b0c147d4e5ddac67d2aa64fea Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/220361 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34140}