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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Screen reference
917System Parameters Call Coverage / Call Forwarding
17
When the system redirects a call off-net at the final coverage point in a coverage
path, the system can apply no further coverage treatment even if the call is
unanswered. The only reason for activating answer detection on such a call is to
maintain the simulated bridged appearance (SBA) on the principal’s phone that
allows the principal to answer or bridge onto the call. However, when the system
monitors the call through use of a call classifier port, there is an inherent
cut-through delay following the detection of answer at the far end. This field has
no consequence when the off-net call is carried end-to-end by ISDN facilities; the
SBA is maintained and there is no cut-through delay.
Ignore Network Answer Supervision
This field appears only if the Coverage of Calls Redirected Off-Net Enabled field
on this screen is
y.
CCRON may use a call classifier port to determine whether an off-net coverage or
forwarded call has been answered, discarding other information that may indicate
an answered state. However, some customers pay the operating company to
provide network answer supervision on their trunks and desire that CCRON not
discard that information. They may preserve this service by setting this field to
n.
On the other hand, beware when you tandem a call over a tie trunk through
another switch node from where it redirects to the public network over non-ISDN
facilities. If the trunk on the far-end node sends a timed answer supervision, that
may get tandemed back to the originating switch as a network answer. In such a
scenario, the originating switch interprets the call as answered, leading to some
undesirable behavior. To avoid these calls from mistakenly be treated as answered,
set this field to
y. An unfortunate consequence is that a short cut-through delay
that is inherent to call classification is introduced when the call is answered.
Valid entries Usage
y
Directs the system to maintain a simulated bridged appearance
on the principal when redirecting to a final off-net coverage
point.
n
Allows the system to drop the SBA on the principal’s phone
when the call redirects off-net at the last coverage point,
eliminating the cut-through delay inherent in CCRON calls,
but sacrificing the principal’s ability to answer the call.
Valid entries Usage
y
Ignore network answer supervision and rely on the call
classifier to determine when a call is answered.
n
Treat network answer supervision as a true answer.