Furuno IB-681 - Manual (Page 22)

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3.4 Call Sequence
3.4.1 Direct call setup sequence
CES NCS FELCOM
SES RQ
Access req. SU
CESI
Ch. assignment req. SU
NCSI
Channal assignment SU
NCSA
Service addr. SU
scr. vec. advise SU
HSUB
HSUB
Scr. vec. ack SU
HSUB
Ret. carrier ID SU
Fill in SU
HSUB
HSUB
CES connect SU
HSUB
DSR ON
CTS/DCD ON
Call to
subscriber
Reply from
subscriber
Calling operation
(DTR ON)
SES connect SU
Figure 5 Direct call setup sequence