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In Figure A) the Receiver 2 is busy and, to keep the Transmitter 1 from re-transmitting its Tx buffer, it periodically sends the ACK segments with BUSY flag. The BUSY segment has an ACK number of the last received segment before the receiver was busy (202). And a SYN SEQ number of the next data to be sent in the opposite direction (101).

 

After the Receiver 2 is ready it reinitiates the data flow by sending the ACK segment with the last ACK number received in order (206). The Tx buffer of the Transmitter 1 is freed and it continues to send new segments.

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