8 Initiator <- Responder : [s]
12 Initiator -> Responder : [e, es, s, ss], INFO..., HALT...
13 Initiator <- Responder : [e, ee, se], INFO..., HALT...
14 Initiator -> Responder : INFO..., FREQ..., DONE...
15 Initiator <- Responder : INFO..., FREQ..., DONE...
16 Initiator -> Responder : FILE..., INFO..., DONE...
17 Initiator <- Responder : FILE..., INFO..., DONE...