Toshiba strata CT Installation & Maintenance Manual page 358

ISDN Interfaces
The above figure shows how the information on the display changes according to the status of
the terminal when the line is disconnected. The content of each type of information is as
shown in
N
N
Notes
H
C
10-32
Table 10-9.
Call Reference Number – The number of the disconnected call displays in a field that
is up to four digits long (2 octets). If the number is not four digits long, the numbers will
start from the far left. In case the call is disconnected before it is picked up, "NA (which
stand for Not Available)" displays on the left.
The highest bit of the call reference number indicates whether the call has been
transmitted or received. For example, if the CT disconnects the call and the call
reference number is "0001," the call has been transmitted by the CT, and if the call
reference number is "8001," it means that the call was received by the CT.
Reason for call termination – The reason is provided by a series of ISDN
disconnection messages exchanged when the line is disconnected. The cause value
within the information element of cause included in these messages will be used.
In case a valid cause value cannot be found when the line is disconnected, "NA (which
stand for Not Available)" displays. (See
On/Off of cause display function is set by programming each terminal (Program 35,
G
LED 08). This setting is only valid for ISDN lines (PRI, BRI (S/T) in TE mode).
Loop start trunk call termination data displays just like the ISDN line— the display
format is the same as when cause display function is switched Off. (For Loop start
trunks, use Program 15-0, 3.)
In case of analogue Tie and DDI lines, the display information remains the same as
G
before.
Even if soft keys are switched on, information on call termination displays instead of
G
the soft key's on status. However, the function of the soft key itself remains valid.
For example, even when the soft key's on status is not displayed, ABR registration
can be enabled by pressing [MODE] key on the terminal corresponding to the soft
key's ABR position.
The cause display remains until some kind of operation (such as going on-hook,
G
making a call, receiving a call, etc.) changes the display. This is to prevent the
display from being changed until the System Administrator reads the information on
call termination when the line is disconnected in an unusual way. At this time, the
busy tone that starts when the line is disconnected will also continue.
Table 10-9 for valid cause code descriptions.)
Strata CT I&M Manual October 2000