Nortel Enterprise 1000 Reference Manual page 67

Figure 21
Two-way, loop DR, tie trunk call states – incoming call from far-end PBX
Note: Where no near-end answer supervision is provided, party at far-end hangs up
after recognizing near-end call termination.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Analog Trunk Cards - NT8D14 Universal Trunk Card
Succession CSE 1000
Ground on tip,
battery on ring
Idle
Far-end
originates
Battery-ground
or loop pulse,
or DTMF
Far-end
disconnects
first
Far-end
disconnects
disconnects
Far-end
hangs up
(Note)
Near-end
answers
(no ans
sup)
Near-end
disconnects
Near-end
(near-end)
Battery on tip,
ground on ring
Near-end
answers
(ans sup)
first
Far-end
disconnects
first
553-CSE6245
Page 67 of 236