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Reply To: MTP2 – Alignment procedure


You have to take care while replying to the msgs, as FISU don’t require the FSN/BSN to be incremented while on the other side LSSU, MSU requires it to be.

The second thing, if you receive SLTM ( test msg ) should reply with in timeout period of the other end. If times out the other end re-enters into aliengment procedure.