Furuno IB-681 - Manual (Page 24)

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3.4.3 Manual 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
HSUB
DSR ON
CTS/DCD ON
Call to
subscriber
Reply from
subscriber
Calling operation
(dialing)
SES connect SU
RI ON
RI OFF
OFF HOOK
(DTR ON)
CES connect
Figure 7 Manual call setup sequence