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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1142Answer detection
20
■ Some calls that are answered may be incorrectly classified as fast busy
signals.
■ Call classifier circuit packs also don’t recognize Special Information Tones
(SIT) as answers.
Of course, the system generates a call record for any call that is classified as
answered whether the classification is correct or not. If Call Classification
incorrectly classifies a call as answered, and then the call is subsequently
answered, the call duration reported by CDR includes the both time between the
incorrect classification and the actual answer and the remaining duration of the
call.
If you want to use call classification, on the System Parameter Customer-Options
screen verify the Answer Supervision by Call Classifier field is
y. If not, contact
your Lucent representative. You also must have a call classifier circuit pack of the
correct type. To find out what circuit packs you need, refer to DEFINITY ECS
System Description.
Network answer supervision
The central office sends a signal to the originating switch to indicate that the far
end has answered. If a call traveled over a private network before reaching the
central office, the signal is transmitted back over the private network to the
originating switch. This method is extremely accurate, but it is not available over
most loop-start trunks (for example, CO, FX and WATS trunks in the US).
Network answer supervision does not override answer supervision by timeout.
Answer supervision by timeout
You set a timer for each trunk group, using the Answer Supervision Timeout field
on the Trunk Group screen. Or you set a circuit pack timer for the ports on that
circuit pack, using the Outgoing End of Dial (sec) field on the Trunk Group
screen. If the caller is off-hook when the timer expires, the system assumes that
the outgoing call has been answered. This is the least accurate method. Calls that
are shorter than the timer duration do not generate call records, and calls that ring
for a long time produce call records whether they are answered.
If network answer supervision is received, it overrides answer supervision by
timeout.
Interactions
■ Call Detail Recording
Answer Detection provides more accurate call records where tone
detection is possible and Network Answer Supervision is not received.