Nortel Enterprise 1000 Reference Manual page 61

Figure 17
Loop start call states – outgoing call
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Analog Trunk Cards - NT8D14 Universal Trunk Card
Succession CSE 1000
High-resistance loop
Idle
Forced far-end
disconnect
Near-end
disconnects
Forced
far-end
disconnect
Near-end
disconnects
Near-end
disconnects first
(near-end)
Low-resistance loop
Near-end originates
Loop pulsing
or DTMF
first
(no ans sup)
Far-end
disconnects
first
Page 61 of 236
Dial tone
from far
end
Ringback
tone from
far-end
Far-end
answers
Far-end
answers
(ans sup)
553-CSE6237